KKILtY
iRARY
STATE OF ILLINOIS
STATE GEOLOGICAL SURVEY
FRANK W. DEWOLF, DIRECTOR
MONOGRAPH 1
THE
MISSISSIPPIAN BRACHIOPODA
OF THE
MISSISSIPPI VALLEY BASIN
PLATES
BY
STUART WELLER
ILLINOIS
STATE GEOLOGICAL SURVEY
URBANA
1914
EARTH
SCIENCES
CAMERON, AM BERG SCO. PRINTERS, CHICAGO.
Plates and Explanations
(All figures are natural size unless otherwise indicated.)
The collection in which each specimen used for illustration
may be found, has been indicated in the explanation of the
plates. The abbreviations used are as follows :
W. M. — Collection of Walker Museum, University of Chicago.
U. M. — Collection of the University of Michigan.
A. M. N. H. — Collection of the American Museum of Natural
History, New York.
U. S. N. M. — Collection of the United States National Museum,
Washington, D. C.
I. S. M. — Collection of the Illinois State Museum, Springfield, 111.
R. R. R. — Collection of R. R. Rowley, Louisiana, Mo.
D. K. G. — Collection of D. K. Greger, Columbia, Mo.
F. A. S. — Collection of F. A. Sampson, Columbia, Mo.
727528
EXPLANATION OF PLATE I.
Figs. 1-2. LINGULA GORBYI Miller p. 35
Views of two separate valves. (W. M., Nos. 9653 and 9654.)
Choutean limestone, Pettis County, Missouri.
Fig. 3. LINGULA LOUISIANENSIS n. sp p. 34
View of a single valve, the holotype. (D. K. G., No. 1901.)
Louisiana limestone, Louisiana, Missouri.
Fig. 4. LINGULA HALLI White p. 35
View of a single valve, the holotype. (U. M., No. 1691.)
Burlington limestone, Burlington, lozva.
Fig. 5. LINGULA MEMBRANACEA Winchell p. 33
View of a single valve, the holotype. (U. M., No. 1330.)
Chonopectus sandstone, Burlington, Iowa.
Fig. 6. LINGULA VARSOVIENSIS Worthen p. 36
View of a single valve, the holotype. (I. S. M., No. 2601.)
Warsaw beds, IVarsaiv, Illinois.
Fig. 7. LINGULA INDIANENSIS Miller & Gurley p. 37
View of a single valve, the holotype. (W. M., No. 6187.)
Crawfordsville shale, Crawfordsville, Indiana.
Fig. 8. LINGULA sp.
View of an imperfect valve. (W. M., No. 7885.)
Chester group, Chester, Illinois.
Fig. 9. LINGULA sp.
View of an imperfect specimen. (W. M., No. 14497.)
St. Louis limestone, Monroe County, Illinois.
Fig. 10. BARROISELLA SUBSPATULATA (Meek & Worthen).
View of a single, very perfect valve. (W. M., No. 7887.)
Devonian black shale, Union County, Illinois.
Fig. 11. GLOSSINA SEDALIENSIS (Miller) p. 37
View of an incomplete valve with the outline restored. (W. M.,
No. 9652.)
Chouteau limestone, Pettis County, Missouri.
Fig. 12. GLOSSINA LINEOLATA (Rowley) , p. 38
View of a single valve, one of the cotypes. (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
Fig. 13. ORBICULOIDEA CAPAX (White) p. 39
View of the holotype, an imperfect brachial valve. (U. M., No.
1331.)
Chonopectus sandstone, Burlington, Iowa.
Figs. 14-17. ORBICULOIDEA KEOKUK (Gurley) p. 41
14-15. Views of the cotypes of the species, a pedicle and a brachial
valve. (W. M., No. 6331.) 16-17. Views of two pedicle valves,
one external and the other internal. (W. M., No. 14787.)
Crawfordsville shale, Crawfordsville, Indiana.
Fig. 18. ORBICULOIDEA sp.
View of a very perfect brachial valve. (W. M., No. 12281.)
Productus magnus bed, Ste. Genevieve County, Missouri.
5
Figs. 19-20. ORBICULOIDEA BATESVILLENSIS Weller p. 42
Views of the internal casts of two brachial valves, the cotypes.
(W. M., No. 4963.)
Batesville sandstone, Batesville, Arkansas.
Figs. 21-22. ORBICULOIDEA SAMPSONI (Miller) p. 40
21. View of a brachial valve, the holotype. (W. M., No. 6962.)
22. View of another brachial valve. (W. M., No. 9674.)
Chouteau limestone, Sedalia, Missouri.
Figs. 23-24. ORBICULOIDEA VARSOVIENSIS (Worthen) p. 41
Views of the cotypes. 24. A nearly complete pedicle valve from the
inner side. 23. Two much crushed valves upon a fragment of
limestone. (I. S. M., No. 2545.)
Keokuk limestone, Warsaw, Illinois.
Figs. 25-26. CRANIA REPOSITA White p. 44
25. View of four specimens of pedicle valves attached to a shell of
Spirifer grimesi. 26. View of a fourth individual from another
portion of the same -S\ grimesi. Cotypes. (U. M., No. 1692.)
Burlington limestone, Burlington, Iowa.
Figs. 27-29. CRANIA CHESTERENSIS Miller & Gurley p. 45
Views of the cotypes, attached to the bases of the bryozoan Lyrio-
pora, and to a shell of Spirifer. (W. M., No. 6067.)
Chester beds, Chester, Illinois.
Fig. 30. CRANIA MISSOURIENSIS Weller p. 43
Exterior view of a brachial valve, the holotype. (W. M., No.
13902.)
Fern Glen formation, Fern Glen, Missouri.
Fig. 31. CRANIA SPICULATA Rowley p. 47
View of a brachial valve, the holotype. (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
Fig. 32. CRANIA DODGEI Rowley p. 44
View of a brachial valve, the holotype. (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
Fig. 33. CRANIA L,EVIS Keyes p. 47
View of a brachial valve, one of the cotypes. (R. R. R.)
Burlington limestone, Louisiana, Missouri.
Figs. 34-36. CRANIA BLAIRI Miller p. 46
34-35. External and internal views of a brachial valve. (W. M.,
No. 9675.) 36. View of a large brachial valve. (W. M., No.
14310.)
Chouteau limestone, Pettis County and Providence, Mis-
souri.
Figs. 37-39. CRANIA ROWLEYI Gurley p. 46
View of a brachial valve, the holotype. (W. M., No. 6316.)
38-39. Views of two other brachial valves. (W. M., Nos. 11895
and 13060.)
Louisiana limestone, Louisiana, Missouri.
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE I.
34
39
EXPLANATION OF PLATE II.
Figs. 1-10. LEPT^ENA ANALOGA (Phillips) , p. 49
1-2. Pedicle and brachial views of a nearly complete specimen.
3-4. External and internal views of another smaller pedicle
valve. (W. M., No. 4696.)
Fern Glen formation, near Kimmswick, Missouri.
5-6. Internal and external views of a nearly complete brachial valve.
(W. M., No. 9719.)
Chouteau limestone, Pettis County, Missouri.
7-9. Pedicle, lateral and profile views of a nearly complete but
somewhat distorted specimen. (W. M., No. 7055.)
Chouteau limestone, Green County, Missouri.
10. View of the internal cast of a pedicle valve. (W. M., 347.)
Lower Burlington limestone, near Springfield, Missouri.
Figs. 11-16. LEPTVENA CONVEXA n. sp p. 52
11. External view of a brachial valve, and 12, external view of a
pedicle valve, in which the geniculate curvature of the shell is
wanting. (W. M., No. 13356.)
Kinderhook, Bed No. 6, Burlington, Iowa. .
13. Internal cast of a pedicle valve, and 14, the impression of the
external surface of a brachial valve. (W. M., No. 6659.)
Kinderhook, Bed No. 5, Burlington, Iowa.
15-16. Two views of a pedicle valve in which the geniculation of the
shell is absent. (W. M., No. 13357.)
Kinderhook oolite, Burlington^, Iowa.
,F,igs. 17-18. STREPTORHYNCHUS ULRICHI Hall & Clarke p. 73
External and internal views of a pedicle: valve, the holotype. (U. S.
N. M., No. 44994.)
Chester group, 2 miles east of Scottsburg, Kentucky.
Figs. 19-22. SCHUCHERTELLA cosxATULA (Hall & Clarke) p. 57
19-20. Brachial and pedicle views of a nearly complete specimen,
the holotype. 21-22. External and internal views of an incom-
plete pedicle valve, the latter showing the entire absence of a
median septum. (W. M., No. 14498.)
Chester group, Crittenden County, Kentucky.
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE II.
22
16
EXPLANATION OF PLATE III.
FigS. 1-9. SCHUCHERTELLA LENS (White) p. 55
1-3. Brachial, pedicle and posterior views of a nearly perfect speci-
men. 4. Brachial view of another nearly perfect specimen.
(W. M., No. 6693.) 5-6. Exterior and interior views of a very
perfect pedicle valve. 7. Interior view of a brachial valve.
8. Interior view of a pedicle valve. (W. M., No. 13051.)
Louisiana limestone, Louisiana. Missouri.
9. View of a large brachial valve. (W. M., No. 14258.)
Louisiana limestone, Calhoun County, Illinois.
Figs. 10-11. SCHUCHERTELLA RUBRA Weller p. 56
Brachial and pedicle views of the holotype. (W. M., No. 13911.)
Fern Glen formation, near Kimmswick, Missouri.
Figs. 12-13. SCHUCHERTELLA FERNGLENENSIS n. sp p. 54
Pedicle and brachial views of a nearly complete but somewhat dis-
torted specimen, the holotype. (W. M., No. 13910.)
Fern Glen formation, Fern Glen, Missouri.
FigS. 14-16. SCHELLWIENELLA IN.EQUALIS (Hall) p. 61
14. A nearly complete internal cast of a brachial valve. (\V. M.,
No. 6662.) 15-16. Two nearly complete internal casts of pedicle
valves. (W. M., Nos. 14755 and 14754.)
Kinderhook, Bed No. 5, Burlington, Iowa.
Figs. 17-18. SCHELLWIENELLA CRENULICOSTATA n. sp p. 63
17. View of a very perfect pedicle valve, the holotype. (W. M.,
No. 14233.)
Kinderhook oolite, Bed No. 6, Burlington, Iowa.
18. View of a modified internal cast of a nearly complete pedicle
valve probably belonging to this species. (W. M., No. 14499.)
Kinderhook, Bed No. 5, Burlington, Iowa.
Figs. 19-22. SCHELLWIENELLA PLANUMBONA n. sp p. 65
19-20. Two nearly complete but more or less exfoliated pedicle
valves. (W. M., No. 14756.) 21-22. Two incomplete and more
or less exfoliated brachial valves. (W. M., Nos. 6671 and
14756.) Cotypes.
Kinderhook oolite, Bed No. 6, Burlington, Iowa.
10
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE III.
EXPLANATION OF PLATE IV.
FigS. 1-2. SCHELLWIENELLA BURLINGTONENSIS n. Sp ..p. 67
1. View of a large, partially exfoliated pedicle valve. 2. View of
a smaller, somewhat crushed brachial valve. Cotypes (W M
No. 13354.)
Burlington limestone, Henderson County, Illinois.
Figs. 3-5. STREPTORHYNCHUS TENUICOSTATUM n. sp p. 69
3-4. Pedicle and brachial views of a nearly complete example.
5. View of an exfoliated brachial valve. Cotypes (W M
No. 9665.)
Chouteau limestone, Chouteau Springs, Missouri.
Fig. 6. SCHELLWIENELLA ALTERNATA n. sp p. 66
View of a nearly complete but somewhat exfoliated brachial valve,
the holotype. (W. M., No. 13355.)
Burlington limestone, Burlington, Iowa.
Figs. 7-12. SCHELLWIENELLA INFLATA (White & Whitfield) p. 59
7-9. Pedicle, lateral and brachial views of a sulphur cast of one of
the cotypes. (W. M., No. 14218.)
Kinderhook, Bed No. 6, Burlington, Iowa.
10. View of an internal cast of a nearly complete brachial valve.
(W. M., No. 13355.) 11-12. Brachial and lateral views of a
nearly complete internal cast of a brachial valve, one of the
cotypes. (U. M., No. 1353.)
Kinderhook, Bed No. 7, Burlington, Iowa.
\2
ILLINOIS STATE GEOLOGICAL SURVEY.
^BB^K
• * /
•
MONOGRAPH No. 1. PLATE IV.
-.«.•" ' /,M
EXPLANATION OF PLATE V.
Figs. 1-19. STREPTORHYNCHUS RUGINOSUM (Hall & Clarke) p. 71
1-5. Pedicle, brachial, lateral, posterior, and anterior views of the
holotype. (W. M., No. 11912.)
St. Louis chert, Providence, Indiana.
6-9. Pedicle, brachial, posterior, and lateral views of a nearly com-
plete specimen. (W. M., No. 10129.)
St. Louis limestone, St. .Louis, Missouri.
10-11. View of an internal cast, and a plaster cast of the natural
mould of the exterior of the same specimen. One of the
cotypes of S. williamsi Weller. (W. M., No. 4956.)
Baicsville sandstone, Batesville, Arkansas.
12. View of a pedicle valve. (W. M., No. 14759.)
St. Louis limestone, Alton, Illinois.
13. View of an internal cast of a nearly complete brachial valve.
14. View of an internal cast of a pedicle valve. (W. M., No.
14758.)
Salem limestone, Hull's Hollow, near Alton, Illinois.
15. View of the internal cast of a small pedicle valve. 16. View of
the internal cast of a brachial valve. (W. M., No. 282.)
Residual chert, Springfield, Missouri.
17-18. Pedicle and brachial views of a nearly complete specimen.
(W. M., No. 10922.)
St. Louis limestone, Alton, Illinois.
19. View of a nearly complete pedicle valve. (W. M., No. 10129.)
St. Louis limestone, St. Louis, Missouri.
14
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE V.
EXPLANATION OF PLATE VI.
Figs. 1-14. ORTHOTETES KASKASKIENSIS McChesney p. 77
1-4. Pedicle, brachial, lateral and posterior views of a nearly com-
plete specimen. 5-8. Pedicle, brachial, posterior and lateral
views of a smaller example. (W. M., No. 10920.)
Pella beds, Pella, Iowa.
13-14. Pedicle and brachial views of a nearly complete example.
(VV. M., No. 8647.)
Chester group, Meade County, Kentucky.
9-12. Brachial, pedicle, posterior and lateral views of a nearly com-
plete specimen. (W. M., No. 8648.)
Chester group, Randolph County, Illinois.
Fig. 15. ORTHOTETES KASKASKIENSIS McChesney (?) p. 77
View of a nearly complete but exfoliated brachial valve which differs
from the more typical representatives of the species in having
much stronger costae at regular intervals. (W. M., 14760.)
Chester group, Red Bud, Illinois.
Figs. 16-21. STREPTORHYNCHUS MINUTUM Cumings p. 70
16-18. Pedicle, brachial and posterior views of a complete example
(x4). 19-21. Similar views of another example (x4). (W. M.)
Salem limestone, Bloomington, Indiana.
16
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE VI.
EXPLANATION OF PLATE VII.
Figs. 1-4. ORTHOTETES KEOKUK Hall p. 75
1-3. Pedicle, brachial and lateral views of a nearly complete but
exfoliated specimen. (W. M., No. 8652.)
Keokuk limestone, Keokuk, Iowa.
4. View of an incomplete internal cast of a pedicle valve showing
the median septum as a slit. (W. M., No. 363.)
Residual chert, Springfield, Missouri.
FigS. 5-8. SCHELLWIENELLA CHOUTEAUENSIS n. Sp p. 64
5-6. Pedicle and brachial views of a nearly complete specimen.
7-8. Brachial view of another less complete specimen. Cotypes.
(W. M., No. 9856.)
Chouteau limestone, Pettis County, Missouri.
FigS. 9-10. SCHUCHERTELLA Sp.
Views of two imperfect pedicle valves. (W. M., No. 11353.)
Glen Park limestone, Glen Park, Missouri.
IS
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE VII.
EXPLANATION OF PLATE VIII.
Figs. 1-7. CHONETES SHUMARDANUS DeKoninck p. 89
1. Pedicle valve of a large individual. 2-3. Pedicle and brachial
views of a specimen preserving both valves. 4-5. Pedicle and
brachial views of another specimen preserving both valves.
6-7. Exterior and interior views of a pedicle valve. (W. M.,
No. 13940.)
New Providence shale, Button Mould Knob, Kentucky.
Figs. 8-16. CHONETES MULTICOSTA Winchell p. 79
8-9. Pedicle and brachial views of a large example preserving
both valves. (W. M., No. 4700.)
Fern Glen formation, Fern Glen, Missouri.
10-11. Views of two large pedicle valves. (W. M., No. 352.)
Burlington limestone, near Springfield, Missouri.
12. View of a pedicle valve, the principal one of Winchell's types.
(U. M., No. 1343.)
Lo-ii'er Burlington limestone (?), Burlington, Iowa.
13. View of a brachial valve, one of Winchell's types. (U. M.,
No. 1343.)
White chert, probably from the Lozver Burlington limestone,
Burlington, lozva.
14-15. External impressions of two brachial valves. 16. An
internal cast of a pedicle valve. (U. M., No. 1343.)
Kinderhook, bed No. 7, Burlington, Iowa.
Fig. 17. CHONETES sp.
The internal cast of a pedicle valve included among the types of
C. multicosta Winchell. (U. M., No. 1343.)
Chonopcctits sandstone, Burlington, Iowa.
Figs. 18-19. CHONETES BURLINGTONENSIS Weller p. 93
18. View of a pedicle valve, the holotype. (W. M., No. 6669.)
19. View of a brachial valve. (W. M., No. 13943.)
Kinderhook oolite, bed Aro. 6, Burlington, Iowa.
Fig. 20. CHONETES MISSOURIENSIS n. sp p. 82
View of a large pedicle valve, the holotype. (W. M., No. 8560.)
Pierson limestone, near Springfield, Missouri.
Figs. 21-29. CHONETES ORNATUS Shumard p. 86
21-24. Pedicle views of four nearly perfect individuals.
25-28. Brachial views of the same four individuals.
29. View of the interior of a brachial valve. (W. M.,
No. 6726.)
Louisiana limestone, Louisiana, Missouri.
Fig. 30. CHONETES GLENPARKENSIS Weller p. 87
View of a pedicle valve, the holotype. (W. M., No. 11355.)
Glen Park limestone, Glen Park, Missouri.
21
Figs. 31-34. CHONETES CHESTERENSIS n. sp p. 83
33-34. Pedicle and brachial views of a nearly complete specimen.
Cotype. (W. M., No. 7693.)
Chester group, Monroe County, Illinois.
31-32. Pedicle and brachial views of a nearly complete specimen.
Cotype. (W. M., No. 14761.)
Chester group, St. Clair County, Illinois.
Figs. 35-42. CHONETES GENICULATUS White p. 92
35-38. Pedicle views of four nearly complete individuals.
39-42. Views of the same four individuals from the brachial
side. (W. M., No. 6727.)
Louisiana limestone, Louisiana, Missouri.
Figs. 43-46. CHONETES LOGANI Norwood & Pratten p. 84
43-44. Views of two pedicle valves. 45-46. Views of two brachial
valves. (W. M., No. 13941.)
Kinderhook oolite, bed No. 6, Burlington, Iowa.
Figs. 47-49. CHONETES GLENPARKENSIS Weller p. 87
Views of three pedicle valves. (W. M., No. 9721.)
Chouteau limestone, Pcttis County, Missouri.
Figs. 50-55. CHONETES sp.
50-52. External views of three somewhat worn pedicle valves.
53. Exterior view of a brachial valve. 54-55. Internal views
of two brachial valves. (W. M.. No. 11354.)
Glen Park limestone, Glen Park, Missouri.
Figs. 56-57. CHONETES sp.
56. View of the impression of the exterior of a brachial valve.
57. View of a pedicle valve. (W. M., No. 13945.)
Kinderhook, bed No. 3, Burlington, Iowa.
Figs. 58-62. CHONETES PLANUMBONA Meek & Worthen p. 94
58-59. Pedicle and brachial views of a nearly perfect individual.
60-61. Similar views of a second example. 62. Brachial view
of a third specimen. (W. M., No. 7684.)
Kcokuk, Ste. Gencvieve County, Missouri.
Figs. 63-70. CHONETES ILLINOISENSIS Worthen p. 81
63. Pedicle view of a nearly perfect valve. 64. View of a group
of shells, one of which is illustrated separately as fig. 63.
(W. M., No. 14380.)
Burlington limestone, Boonevillc, Missouri.
65. Pedicle view. 66. Brachial view. 67. View of the interior
of a brachial valve. (W. M., No. 2968.)
Burlington limestone, Springfield, Missouri.
68. Pedicle view. 69. Brachial view. 70. View of the interior
of a brachial valve. (W. M., No. 2969.)
Keokuk limestone, near Springfield, Missouri.
Figs. 71-72. CHONETES GREGARIUS Weller p. 91
Views of two pedicle valves. (W. M., No. 13944.)
Kinderhook, bed No. 3, Burlington, Iowa.
Fig. 73. CHONOPECTUS FISCHERI Norwood & Pratten p. 96
View of a very perfect pedicle valve. (W. M., No. 6657.)
Kinderhook, bed No. 3, Burlington, Iowa.
22
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE VIII.
8
9
10
12
13
14
15
11
16
25
18
19
20
17
21 22 23 24 3° 31 33
26 27 28 29 32 34
J
35
*
36
37
J
38
r
39
r
40
42
43 44 45 46
47
Jl J J
5O 51 52 53
48 49
54 55 56 57
73
EXPLANATION OF PLATE IX.
Figs. 1-10. PRODUCTUS BURLINGTONENSIS Hall p. 104
1-3. Pedicle, posterior and lateral views of a pedicle valve.
4-5. Pedicle and posterior views of another pedicle valve.
(W. M., No. 14303.) 6-8. Pedicle lateral and posterior views
of a nearly perfect pedicle valve. (W. M., No. 14287.)
Burlington limestone, Burlington, Iowa.
9. View of a somewhat imperfect specimen of the interior of a
brachial valve. (W. M., No. 345.)
Burlington limestone, Springfield, Missouri.
10. View of a nearly complete specimen from the brachial side,
showing the concave brachial valve. (W. M., No. 14288.)
Burlington limestone, Quincy, Illinois.
Figs. 11-17. PRODUCTUS FERNGLENENSIS Weller p. 105
11-13. Pedicle, posterior and lateral views of a nearly complete
pedicle valve. 14. View of another pedicle valve. 15. View
of a large pedicle valve. 16. View of a brachial valve from
the interior, showing the cardinal process ; over the greater
portion of the specimen the shell substance has been destroyed
so that an impression of the exterior of the valve is exposed.
Cotypes. (W. M., No. 4669.)
Fern Glen formation, near Kinnnswick, Missouri.
17. View of a pedicle valve. (W. M., No. 8556.)
Pier son limestone, near Springfield, Missouri.
24
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE IX.
EXPLANATION OF PLATE X.
Figs. 1-6. PRODUCTUS INFLATUS McChesney p. Ill
1-3. Pedicle, posterior and lateral views of a nearly perfect
pedicle valve. (W. M., No. 14762.)
Chester group, Red Bud, Illinois.
4-6. Pedicle, posterior and lateral views of a nearly perfect pedicle
valve. (W. M., No. 14304.)
Chester group, Meade County, Kentucky.
Figs. 7-13. PRODUCTUS MESIALIS Hall p. 1 12
7-9. Pedicle, posterior and lateral views of a pedicle valve.
10-12. Similar views of another example. 13. View of a
natural impression of a brachial valve. (W. M., No. 14329.)
Chert from Keokuk (?) , Pierce City, Missouri.
Figs. 14-24. PRODUCTUS ALTONENSIS Norwood & Pratten p. 124
14. Posterior view of a pedicle valve. (W. M., No. 14295.)
Salem limestone, S per gen Hill, Indiana.
15. Brachial view of a nearly complete shell. 16-18. Posterior,
brachial and lateral views of a nearly complete shell. (W. M.,
No. 14305.)
Salem limestone, Harrison County, Indiana.
19-21. Pedicle, posterior and lateral views of a nearly complete
pedicle valve. (W. M., No. 3142.)
Salem limestone, Washington County, Indiana.
22-24. Pedicle, posterior and lateral views of a nearly complete
pedicle valve. (W. M., No. 14296.)
Salem limestone, Spergen Hill, Indiana.
Figs. 25-27. PRODUCTUS TENUICOSTUS Hall p. 119
Pedicle, brachial and lateral views of a nearly complete internal
cast of a pedicle valve which probably belongs to this species.
(W. M., No. 279.)
Residual chert, Springfield, Missouri.
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE X.
24
EXPLANATION OF PLATE XI.
Figs. 1-5. PRODUCTUS TENUICOSTUS Hall p. 119
1-3. Pedicle, lateral and posterior views of a good pedicle valve.
(W. M., No. 14283.)
St. Louis limestone, Alton, Illinois.
4-5. Pedicle and lateral views of another pedicle valve. (W. M.,
No. 14284.)
St. Louis limestone, Milan, Illinois.
Figs. 6-11. PRODUCTUS VIMINALIS White p. 114
6. Pedicle view of the holotype, a somewhat crushed pedicle
valve. 9-10. Pedicle and lateral views of a large pedicle valve,
an authentic specimen associated with the holotype in the White
Collection at the University of Michigan. (U. M., No. 1693.)
Burlington limestone, Burlington, Iowa.
9-10. Pedicle and lateral views of a nearly perfect and undistorted
pedicle valve. (W. M., No. 14291.)
Burlington limestone, Quincy, Illinois.
11. View of a natural mould of the external surface of the
brachial valve, with a portion of the valve, including the
cardinal process, adhering posteriorly. (W. M., No. 7925.)
Burlington limestone, Springfield, Missouri.
Figs. 12-16. PRODUCTUS MESICOSTALIS n. sp p. 114
12. View of a pedicle valve. 13-15. Pedicle, posterior and
lateral views of a pedicle valve. 16. Interior view of a bra-
chial valve. (W M., No. 10585.)
English River grit, Maple Mill, Washington County, Iowa.
28
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XL
EXPLANATION OF PLATE XIII.
Figs. 1-12. PRODUCTUS ARCUATUS Hall p. 107
1-3. Pedicle, lateral and posterior views of a very perfect pedicle
valve. 4-5. Pedicle and lateral views of a natural mould of
the concave brachial valve. (W. M., No. 9823.)
Chouteau limestone, Choutcau Springs, Missouri.
6-8. Pedicle, lateral and posterior views of a very perfect pedicle
valve. (W. M., No. 14285.) 9-10. Pedicle and lateral views
of a nearly complete specimen. 11-12. Pedicle and lateral
views of the natural mould of the concave brachial valve of
the same shell. (W. M., No. 14330.)
Kinderhook oolite, bed No. 6, Burlington, Iowa.
Figs. 13-17. PRODUCTUS WORTHENI Hall p. 126
13-15. Pedicle, lateral and posterior views of a nearly perfect
pedicle valve. 16. Pedicle view of a natural mould of the
external surface of a brachial valve. (W. M., No. 281.)
Residual chert, Springfield, Missouri.
17. Pedicle view of a nearly complete natural mould of the ex-
ternal surface of a brachial valve. (W. M., No. 294.)
Keokuk limestone, near Springfield, Missouri.
Figs. 18-23. PRODUCTUS MARGINICINCTUS Prout p. 127
18-19. Pedicle and brachial views of a nearly complete example.
20-21. Pedicle and lateral views of a nearly complete pedicle
valve. (W. M., No. 10846.) 22-23. Pedicle and lateral views
of another nearly complete pedicle valve. (W. M., No. 14290.)
St. Louis limestone, St. Louis., Missouri.
Figs. 24-29. PRODUCTUS SCITULUS Meek & Worthen p. 120
24-26. Pedicle, lateral and posterior views of a nearly complete
pedicle valve. (W. M., No. 13128.)
St. Louis limestone, St. Louis, Missouri.
27-28. Views of two nearly perfect internal casts of pedicle valves.
29. View of the impression of the exterior of a brachial
valve. (W. M., No. 14764.)
St. Louis limestone (chert), Fountain Creek, Monroe
County, Illinois.
Figs. 30-35. PRODUCTUS SAMPSON: Weller p. 129
30-33. Pedicle, brachial, lateral and posterior views of a nearly
perfect shell. The holotype. (W. M., No. 9695.)
Chouteau limestone, Pettis County, Missouri.
34-35. Views of two larger pedicle valves. (W. M., No. 4698.)
Fern Glen formation, near Kiinmswick, Missouri.
32
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XIII.
10
13
14
15
12 11
16
18
19
22
:
^^
23
24 25 26
30 31
32
20
21
27
28
29
33 34
35
EXPLANATION OF PLATE XIV.
Figs. 1-7. PRODUCTUS SEDALIENSIS n. sp p. 108
1-2. Pedicle and lateral views of a large specimen. 3-5. Pedicle,
lateral and posterior views of another smaller specimen.
6-7. Pedicle and lateral views of a natural mould of the
exterior of a brachial valve. (W. M., No. 9691.)
Chouteau limestone, Pettis County, Missouri.
Figs. 8-13. PRODUCTUS CURTIROSTRIS Winchell p. 130
8-9. Lateral and pedicle views of a pedicle valve. 10-11. Poste-
rior and pedicle views of another pedicle valve. Cotypes.
(U. M., No. 1337.)
Chonopcctus sandstone, Burlington, Iowa.
12-13. Views of two pedicle valves. In fig. 13 the material has
been broken away in such a manner as to exhibit the impres-
sion of the brachial valve. (W. M., No. 10576.)
English River grit, Maple Mill, Washington County, Iowa.
Figs. 14-21. PRODUCTUS BLAIRI Miller p. 110
14-16. Pedicle, brachial and lateral views of a nearly complete
specimen. 17-19. Similar views of another example. (W. M.,
No. 9824.)
Chouteau limestone, Chouteau Springs, Missouri.
20-21. Pedicle views of the natural moulds of two brachial
valves. (W. M., No. 9692.)
Chouteau limestone, Pettis County, Missouri.
Figs. 22-23. PRODUCTUS sp.
Pedicle and brachial views of a nearly complete shell. (W. M.,
No. 9825.)
Chouteau limestone, Chouteau Springs, Missouri.
Figs. 24-25. PRODUCTUS PARVULUS Winchell p. 12S
Views of two pedicle valves. Cotypes. (U. M., No. 1338.)
Kinderhook, bed No. 5, Burlington, Iowa.
Figs. 26-27. PRODUCTUS sp.
Pedicle and lateral views of a nearly complete pedicle valve.
(D. K. G., No. 2101.)
Burlington limestone, Louisiana, Missouri.
34
ILLINOIS STATE GEOLOGICAL SURVEY.
17
MONOGRAPH No. 1. PLATE XIV.
i
16
19
22
23
27
26
25 24
EXPLANATION OF PLATE XV.
Figs. 1-8. PRODUCTUS MAGNUS Meek & Worthen p. 117
1-3. Pedicle, lateral and posterior views of a nearly complete
pedicle valve. 4. View of a natural mould of the exterior of
brachial valve. (W. M., No. 14321.) 5. Posterior view of
another example showing the arrangement of spine bases along
the cardinal margin. (W. M., No. 14765.)
Keokuk, Monroe County, Illinois.
6-8. Pedicle, lateral and posterior views of a smaller example,
having the characters of the shell described as P. fcutoncnsis
by Shumard. (W. M., No. 14308.)
Keokuk, Fenton, St. Louis County, Missouri.
36
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XV.
EXPLANATION OF PLATE XVI.
Figs. 1-15. PRODUCTUS OVATUS Hall p. 132
1-3. Pedicle, lateral and posterior views of a nearly complete
pedicle valve. (Productus pileiformis.) (W. M., No. 14323.)
Chester group, Chester, Illinois.
4-5. Pedicle and lateral views of a pedicle valve. 6-7. Direct
and profile views of the external impression of a brachial valve.
(Productus pileiformis.) (W. M., No. 14314.)
Chester group, Meade County, Kentucky.
8-9. Pedicle and lateral views of a nearly complete pedicle
valve. (W. M., No. 326.) ,
Keokuk limestone, near Springfield, Missouri.
10-11. Pedicle and lateral views of a nearly complete pedicle
valve. (W. M., No. 10130.)
St. Louis limestone, St. Louis, Missouri.
12. Direct view of an incomplete pedicle valve. (Productus Icevi-
costus White.) (W. M., No. 6714.)
Kinderhook, bed No. 7, Burlington, Iowa.
13. Direct view of a pedicle valve. (Productus l&vicostus White)
(W. M., No. 5924.)
Chonopcctus limestone, Burlington, Iowa.
14-15. Brachial and pedicle views of an incomplete specimen
preserving both valves. (Productus Icuvicostus White)
(W. M., No. 296.)
Lower Burlington limestone, near Springfield, Missouri.
Figs. 16-22. PRODUCTUS PARVUS (Meek and Worthen) p. 121
16-19. Pedicle, brachial, lateral and posterior views of a very
perfect shell. (W. M., No. 9915.)
Chester group, Chester, Illinois.
20-22. Posterior, lateral and pedicle views of another perfect
specimen. (W. M., No. 10923.)
Pclla beds, Pella, Iowa.
38
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. I. PLATE XVI.
"*m
14
15
11
16
17 18
19
20
21
EXPLANATION OF PLATE XVI.
Figs. 1-15. PRODUCTUS OVATUS Hall p. 132
1-3. Pedicle, lateral and posterior views of a nearly complete
pedicle valve. (Productus pileiformis.) (W. M., No. 14323.)
Chester group, Chester, Illinois.
4-5. Pedicle and lateral views of a pedicle valve. 6-7. Direct
and profile views of the external impression of a brachial valve.
(Productus pileiformis.) (W. M., No. 14314.)
Chester group, Meade County, Kentucky.
8-9. Pedicle and lateral views of a nearly complete pedicle
valve. (W. M., No. 326.) •
Keokuk limestone, near Springfield, Missouri.
10-11. Pedicle and lateral views of a nearly complete pedicle
valve. (W. M., No. 10130.)
St. Louis limestone, St. Louis, Missouri.
12. Direct view of an incomplete pedicle valve. (Productus Iccvi-
costus WhiteJ (W. M., No. 6714.)
Kinderhook, bed No. 7, Burlington, Iowa.
13. Direct view of a pedicle valve. (Productus l&vicostus White)
(W. M., No. 5924.)
Chonopectus limestone, Burlington, Iowa.
14-15. Brachial and pedicle views of an incomplete specimen
preserving both valves. (Productus la-z'icostus White)
(W. M., No. 296.)
Lower Burlington limestone, near Springfield, Missouri.
Figs. 16-22. PRODUCTUS PARVUS (Meek and Worthen) p. 121
16-19. Pedicle, brachial, lateral and posterior views of a very
perfect shell. (W. M., No. 9915.)
Chester group, Chester, Illinois.
20-22. Posterior, lateral and pedicle views of another perfect
specimen. (W. M., No. 10923.)
Pella beds, Pella, Iowa.
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XVI.
14
,
15
13
22
16
17 18
19
20 21
EXPLANATION OF PLATE XVII.
Figs. 1-7. ECHINOCONCHUS ALTERNATUS (Norwood and Pratten) p. 138
1-4. Pedicle, brachial, lateral and posterior views of a nearly com-
plete shell without the surface spines. (W. M., No. 14318.)
Keokuk limestone, Warsaw, Illinois.
5. View of the interior of a nearly complete brachial valve.
(W. M., No. 14316.)
Crawfordsville shale, Crawfordsvillc, Indiana.
6-7. Lateral and pedicle views of a pedicle valve from which the
spines are missing. (W. M., No. 14319.)
Keokuk limestone, Warsaw, Illinois.
Figs. 8-9. ECHINOCONCHUS sp.
Lateral and pedicle views of a large and nearly complete pedicle
valve lacking the spines. (W. M., No. 12988.)
St. Louis limestone, Carondelet, Missouri.
Figs. 10-15. ECHINOCONCHUS BISERIATUS (Hall) p. 141
10-13. Pedicle, brachial, lateral and posterior views of a nearly
perfect specimen, lacking the spines. (W. M., No. 14315.)
Salem limestone, Spergen Hill, Indiana.
14. The impression of the external surface of a brachial valve.
15. View of the interior of a brachial valve. (W. M.,
No. 14766.)
Salem limestone, Hull's Hollow, near Alton, Illinois.
40
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XVII.
EXPLANATION OF PLATE XVIII.
FigS. 1-6. ECHINOCONCHUS GENEVIEVENSIS II. sp p. 139
1-2. Pedicle and posterior views of a pedicle valve. 3-4. Pedicle
and lateral views of another specimen. (W. M., No. 14767.)
Ste. Genevieve limestone, 2 mi. N. E. Columbia, Illinois.
5. The impression of the external surface of a brachial valve.
6. View of a small pedicle valve. (W. M., No. 14768.)
Ste. Genevieve limestone, Columbia, Illinois.
Figs. 7-10. PRODUCTUS INDIANENSIS Hall p. 131
7-8. Views of two brachial valves, natural size. 9-10. Pedicle
and lateral views of the specimen illustrated in Fig. 7 (x 4).
CW. M., No. 14325.)
Salem limestone, Spergen Hill, Indiana.
Figs. 11-12. PRODUCTUS sp.
External and internal views of a free brachial valve. (W. M.,
No. 7864.)
Salem limestone (f), Jersey County, Illinois.
Figs. 13-15. ECHINOCONCHUS MORBILLIANUS (Winchell) p. 142
Pedicle, lateral and posterior views of the holotype. (U. M.,
No. 2002.)
Base of Burlington limestone, Burlington, Iowa.
Fig. 16. PRODUCTUS sp.
One of the specimens associated with the type of Echinoconchus
morbillianus by Winchell, but clearly not a member of the same
species. (U. M., No. 2003.)
Chonopectus limestone, Burlington, Iowa.
Figs. 17-18. STROPHALOSIA KEOKUK Beecher p. 145
A specimen of usual size attached to a shell of Platyceras.
18. The same (x 4). (W. M., No. 13008.)
Kcokuk limestone, Crawfordsville, Indiana.
Figs. 19-23. STROPHALOSIA SCINTILLA Beecher '.p. 144
19-20. Specimens of usual size attached to the shells of Product-
ella pyxidata. (W. M., No. 6701.) 21. Another similar
specimen. (W. M., No. 13048.) 22. An enlargement of
Fig. 20 to x 4. 23. A similar enlargement of Fig. 21 to x 4.
Louisiana limestone, Louisiana, Missouri.
42
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XVIII.
6
13
14
15
8
11
16
12
20
17
19
21
EXPLANATION OF PLATE XIX.
Figs. 1-21. PRODUCTELLA PYXIDATA Hall p. 100
1-14. Pedicle and brachial views of seven nearly perfect shells.
15. View of the interior of a brachial valve. 16-21. Pedicle
and lateral views of three very perfect specimens. (W. M.,
No. 6696.)
Louisiana limestone, Louisiana, Missouri.
Figs. 22-34. PRODUCTELLA CONCENTRICA (Hall) p. 98
22. View of the natural mould of a brachial valve, the holotype.
(A. M. N. H., No. 5080-1.)
Kindcrhook, bed No. 5, Burlington, Iowa.
23-24. Views of the natural moulds of two brachial valves, en-
tirely similar to the holotype. 25-26. Pedicle and lateral views
of a nearly complete pedicle valve. 27-28. Similar views of
another example. (W. M., No. 9821.)
Choutcau limestone, Choutcau Springs, Missouri.
29-31. Pedicle, brachial and lateral views of a nearly complete
specimen. (W. M., No. 6713.)
Kinderhook, Burlington, Iowa.
32-34. Pedicle, lateral and posterior views of a nearly perfect pedi-
cle valve. (W. M., No. 14769.)
Kinderhook, bed No. 6, Burlington, Iowa.
Figs. 35-36. STROPHALOSIA CYMBULA Hall & Clark p. 145
Pedicle and brachial views of a nearly complete specimen, the
holotype. (W. M., No. 11897.)
New Providence shale, south of Louisville, Ky.
Figs. 37-38. STROPHALOSIA BEECHERI Rowley p. 146
Pedicle and brachial views of a nearly perfect pedicle valve,
filled with matrix, but showing the cardinal area. The holo-
type. (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
Figs. 39-41. PRODUCTELLA NUMMULARIS (Winchell) p. 101
39. View of the exterior of a brachial valve. 40. Internal view
of a brachial valve. 41. View of a pedicle valve. Cotypes. (U.
M., No. 1340.)
Chonopectus sandstone, Burlington, Iowa.
44
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XIX.
3
8
9
12
23
26
13
14
15
24
27 28
30 31
34
33
v
37
4O
41
39
38
EXPLANATION OF PLATE XX.
Figs. 1-8. RHIPIDOMELLA MISSOURIENSIS (Swallow) p. 148
1-3. Pedicle, brachial and lateral views of a very perfect specimen.
4-6. Similar views of another specimen. 7. Internal view of a
pedicle valve, showing the muscular scar. 8. Internal view
of a brachial valve. (W. M., No. 6692.)
Louisiana limestone, Louisiana, Missouri.
Figs. 9-18, 30-35. RHIPIDOMELLA DIMINUTIVA Rowley p. 153
9-11. Pedicle, brachial and lateral views of a nearly complete
specimen. (R. R. R.) 12-13. Pedicle and brachial views of
another example. 14. Internal view of a pedicle valve. 15.
Internal view of a brachial valve. (W. M., No. 14222.)
Burlington white chert, Louisiana, Missouri.
16-18. Pedicle, brachial and lateral views of a nearly complete
specimen. (W. M., No. 8552.)
Pier son limestone, near Springfield, Missouri.
30-32. Pedicle, brachial and lateral views of a very perfect speci-
men, similar in size to the type specimen. 33-35. Views of the
same specimen enlarged (x2). (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 19-21. RHIPIDOMELLA sp.
Brachial, lateral and pedicle views of a nearly complete but
slightly distorted specimen. (W. M., No. 14220.)
Fern Glen formation, near Kimmswick, Missouri.
Figs. 22-26. RHIPIDOMELLA DUBIA (Hall) *. . .p. 160
22-24. Pedicle, brachial and lateral views of a very perfect ex-
ample. 25-26. Internal views of two pedicle valves. (W. M.,
No. 13055.)
Salcin limestone, Spcrgen Hill, Indiana.
Figs. 27-29. RHIPIDOMELLA TENUICOSTATA n. sp p. 158
27. Pedicle view of a nearly complete specimen. 28. Brachial
view of another specimen. 29. Interior view of a brachial
valve. Cotypes. (W. M., No. 9673.)
Chouteau limestone, Pettis County, Missouri.
Figs. 36-43. RHIPIDOMELLA JERSEYENSIS n. sp .p. 157
36-38. Pedicle, brachial and lateral views of a nearly complete
specimen. 39. View of a brachial valve. (W. M., No. 7843.)
Fern Glen formation, near Elsah, Illinois.
40. Internal view of a pedicle valve. (W. M., No. 4691.) 41. In-
ternal view of another pedicle valve. 42-43. Internal views of
two brachial valves. (W. M., No. 4692.)
Fern Glen formation, near Kinnnswick, Missouri.
46
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XX.
27
I * *
^ 30 31
21
33 34 35
42
43
36 37 38 39
40
41
EXPLANATION OF PLATE XXI.
Figs. 1-4. RHIPIDOMELLA OWENI Hall & Clarke. p. 151
1-2. External and internal views of a nearly perfect pedicle valve.
(W. M., No. 4675.) 3-4. External and internal views of a
nearly complete brachial valve. (W. M., No. 7857.)
New Providence shale, Button Mould Knob, Kentucky.
Figs. 5-7. RHIPIDOMELLA BURLINGTONENSIS (Hall) p. 149
5. View of a nearly perfect pedicle valve. (W. M., No. 11893.)
Burlington limestone, Sagctown, Illinois.
6. Similar view of another pedicle valve. (W. M., No. 7858.)
Burlington limestone, Burlington, Iowa.
7. Pedicle view of an internal cast, a little restored at the beak.
(W. M., No. 13045.)
Chert of Burlington limestone, Pike County, Missouri.
Figs. 8-27. RHIPIDOMELLA THIEMEI (White) p. 155
9-18. External and internal views of five pedicle valves. 19-24.
External and internal views of three brachial valves. 25-27.
Pedicle, brachial and lateral views of a nearly complete speci-
men. Cotypes. (U. M., No. 1348.)
Kinderhook, Bed No. 7, Burlington, Iowa.
8. View of a nearly perfect pedicle valve. (W. M., No. 6670.)
Kinderhook, Bed No. 6, Burlington, Iowa.
Figs. 28-32. SCHIZOPHORIA SEDALIENSIS n. sp p. 164
28-31. Pedicle, brachial, lateral and posterior views of a nearly
perfect specimen. 32. View of the interior of an incomplete
pedicle valve, showing the muscular scar. (W. M., No. 14225.)
Upper Chouteau limestone, Sedalia, Missouri.
Figs. 33-34. SCHIZOPHORIA sp.
33. View of the internal cast of a brachial valve. 34. View of an
incomplete internal cast of a pedicle valve. (U. Ml, No. 1351.)
Chonopectus sandstone, Burlington, Iowa.
48
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXI.
f f • •
11 13 15 17
17 19
10 12
14
16
18 20
21 22 23 24 25 26 27
EXPLANATION OF PLATE XXII.
Figs. 1-6. SCHIZOPHORIA SWALLOVI (Hall) p. 167
1. View of a very perfect pedicle valve. (W. M., No. 7916.)
Burlington limestone, Springfield, Missouri.
2. Similar view of another pedicle valve. 3. View of a small
brachial valve. (W. M., No. 7861.)
Burlington limestone, Henderson County, Illinois.
4-5. Brachial and posterior views of a nearly complete but some-
what crushed example. (W. M., No. 7862.)
Burlington limestone, Burlington, Iowa.
6. View of internal cast of a pedicle valve. (W. M., No. 14233.)
Chert of Burlington limestone, Sedalia, Missouri.
Figs. 7-14. SCHIZOPHORIA POSTSTRIATULA n. sp p. 165
7-11. Pedicle, brachial, anterior, posterior and lateral views of a very
perfect, but somewhat unsymmetrical specimen. Cotype. (D.
K. G., No. 2701.)
Fern Glen formation, Fern Glen, Missouri.
12-13. Pedicle and posterior views of a nearly complete but some-
what crushed example. 14. View of the interior of the rostral
portion of a pedicle valve. Cotypes. (W. M., No. 4693.)
Fern Glen formation, near Kinimswick, Missouri.
Figs. 15-17. SCHIZOPHORIA POSTSTRIATULA n. sp. (?) p. 165
Brachial, pedicle and posterior views of a nearly complete but
somewhat crushed specimen. (W. M., No. 8553.)
Pierson limestone, near Springfield, Missouri.
50
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXII.
EXPLANATION OF PLATE XXIII.
Figs. 1-5. SCHIZOPHORIA SUBELLIPTICA (White & Whitfield) p. 162
1-2. Views of two pedicle valves. (W. M., No. 14227.) 3. View
of a brachial valve, one of the cotypes. 5. View of a large
brachial valve, one of the cotypes. (U. M., No. 1349.)
Kindcrhook, bed No. 6, Burlington, Iowa.
Figs. 6-19. SCHIZOPHORIA CHOUTEAUENSIS n. sp p. 163
6-7. Pedicle and brachial views of a nearly perfect specimen.
8-11. Brachial. pedicle, lateral and posterior views of a small
but very perfect example. (W. M., No. 14226.)
Chontcau limestone, Providence, Missouri.
12-16. Brachial. pedicle, lateral, anterior and posterior views of a
nearly perfect specimen. (W. M., No. 9689.)
Choutcau limestone, Pettis County, Missouri.
17-19. Brachial, pedicle and posterior views of a nearly perfect
shell with much more depressed pedicle valve than usual. It
is possible that this specimen should not be referred to this
species. (W. M., No. 8572.)
Choutcau limestone, Green County, Missouri.
Figs. 20-45. CAMAROPHORIA BISINUATA (Rowley) p. 172
20-24. Pedicle, brachial. lateral, anterior and posterior views of a
slightly compressed but very perfect internal cast. 25-29.
Similar views of another very perfect internal cast. The me-
dian septum is shown clearly in both of these specimens, that
of the brachial valve less clearly. (W. M., No. 9108.)
Residual chert, Springfield, Missouri.
30-33, 34-37, 38-41. Pedicle, brachial, lateral and anterior views of
three very perfect specimens, metatypes. Fig. 39 shows clearly
the median septum of the brachial valve where the shell has
been exfoliated. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
42-45. Pedicle, brachial, lateral and anterior views of a very per-
fect specimen referred to this species. (W. M., No. 13929.)
Kcokuk limestone, Warsaw, Illinois.
Figs. 46-51. CAMAROPHORIA EXPLANATA (McChesney) p. 173
46-47. Pedicle and brachial views of a sulphur cast of the holotype.
(W. M., No. 12424.)
Chester group, Illinois.
48-51. Pedicle, brachial, lateral and anterior views of a very per-
fect specimen. (W. M., No. 7726.)
Chester group, Chester, Illinois.
Figs. 52-60. CAMAROPHORIA HAMBURGENSIS Weller p. 170
52-55. Brachial, pedicle, lateral and anterior views of a small but
nearly perfect specimen. 56-58. Views of three detached
brachial valves. 59-60. Views of two detached pedicle valves.
(W. M., No. 13937.)
Hamburg oolite (Kindcrhook), Hamburg, Illinois.
52
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE XXIII.
11
9
10
19
17
18
15
12
13
14
16
28 29
» I
20 21 22
23
24 25 26 27
> •
3O 31 32
33
34 35
*
36
37
42 43 44 45
41
38 39 4O
46 47 48 49 5O 51 52 53
^^^^ I-
60 59
58 57
55
I
54
EXPLANATION OF PLATE XXIV.
Figs. 1-8. CAMAROTCECHIA ELEGANTULA Rowley p. 177
Pedicle, brachial, lateral and anterior views of two nearly perfect
specimens. Metatypes. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 9-28. CAMAROTCECHIA TUTA (Miller) p. 179
9-16. Pedicle, brachial, lateral and anterior views of two nearly
perfect specimens. (D. K. G., No. 804.)
Chouteau limestone, Scdalia, Missouri.
17-20. Pedicle, brachial, lateral and anterior views of a nearly
perfect specimen. (D. K. G., No. 1002.)
Lake Valley Beds, Sierra County, New Mexico.
21-24. Pedicle, brachial, lateral and anterior views of a nearly
complete specimen. (D. K. G., No. 902.) 25-28. Similar
views of another, larger specimen probably representing the
same species. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 29-33. CAMAROTCECHIA SUBGLOBOSA n. sp p. 180
Pedicle, brachial, lateral, posterior and anterior views of a very
perfect internal cast. Holotypes. (D. K. G., No. 702.)
Burlington chert, Newark, Knox County, Missouri.
Figs. 34-40. CAMAROTCECHIA CHOUTEAUENSIS (Weller) p. 176
34-37. Pedicle, brachial, lateral and anterior views of a very per-
fect specimen. Cotypes. (W. M., No. 9704.)
Chautcau limestone, Scdalia, Missouri.
38-40. Pedicle, lateral and anterior views of a smaller example.
Cotype. (W. M., No. 6709.)
Chouteau limestone, Chouteau Springs, Missouri.
Figs. 41-60. CAMAROTCECHIA MUTATA (Hall) p. 181
41-48. Pedicle, brachial, anterior and lateral views of two very
large individuals. (W. M., No. 7735.)
Salem limestone, Spcrgcn Hill, Indiana.
53-60. Pedicle, brachial, lateral and anterior views of three nearly
complete specimens. (W. M., No. 13931.)
Salem limestone, Hull's Hollow, near Alton, Illinois.
Figs. 61-72. CAMAROTCECHIA GROSVENORI (Hall) p. 183
61-62. Pedicle and brachial views of a small specimen. 63. An-
terior view of a larger example. 64. The same enlarged
(x4). (W. M., No. 13932.)
Salem limestone, Stincsville, Indiana.
65-68. Pedicle, brachial, lateral and anterior views of a large
specimen. 69-72. Similar views of another specimen. (W.
M., No. 13935.)
Salem limestone, Bloomington, Indiana.
Figs. 73-81. ALLORHYNCHUS HETEROPSIS (Winchell) p. 197
73-76. Brachial, pedicle, lateral and anterior views of a nearly com-
plete specimen. 77-79. Pedicle, brachial and lateral views of a
very perfect specimen. 80-81. Pedicle and brachial views of a
third specimen. (Wl M., No. 4756.)
Kinderhook, Bed No. 4, Burlington, Iowa.
55
Fig. 82. RHYNCHOPORA PUSTULOSA (White) p. 230
View of a large pedicle valve. (W. M., No. 4821.)
Kinderhook, Bed No. 4, Burlington, Iowa.
Figs. 83-86. ALLORHYNCHUS ACUTIPLICATUM n. sp p. 201
Pedicle, brachial, lateral and anterior views of a very perfect speci-
men. Holotype. (D. K. G., No. 2404.)
Carterville formation1'!). Webb City, Alissonri.
56
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXIV.
'U*
J
..F V
9 10 11 12 13
6
•\W
14
15 16
J J
17 is 19 20 21 22 23 24
29 30 31 32 33
25 26 27
34 35 36 37
m
38
4O 28
41 42 43 44 45 46
m
47 48
A
W^
49 5O 51 52 53 54
55
56
' li
57 58
59 6O
61 62 63
64
65 66
o a
67 68 69 7O 71
72
73
74 75
76
I
77 78
83
84 85 86 SO 81 82
EXPLANATION OF PLATE XXV.
Figs. 1-6. ALLORHYNCHUS MACRA (Hall) p. 199
1-2, 3-4. Pedicle and brachial views of two examples of about maxi-
mum size. (W. M., No. 13936.)
Salem limestone, Hull's Hollow, above Alton, Illinois.
5-6. Pedicle and brachial views (x4) of a small example having
the characteristics of Rhynchonella ricinula Hall. (W. M.,
No. 2992.)
Salem limestone, Stinesville, Indiana.
Figs. 7-17. PUGNOIDES OTTUMWA (White) p. 193
7-9. Pedicle, brachial and posterior views of a large and broad
specimen. 10-11, 12-13. Pedicle and brachial views of two very
perfect examples. 14-17. Pedicle, brachial, anterior and poste-
rior views of a nearly perfect specimen. (W. M., No. 13930.)
Ste. Genevieve limestone, Fountain Creek, near Waterloo,
Illinois.
Figs. 18-21. RHYNCHOPORA (?) PERRYENSIS n. sp p. 239
Pedicle, brachial, anterior and lateral views of a very perfect speci-
men. (D. K. G., No. 2304.)
Landing 76, Perry County, Missouri.
Figs. 22-26. PUGNOIDES BOONENSIS (Shumard) p. 195
Pedicle, brachial, anterior, posterior and lateral views of a very
perfect specimen. (D. K. G., No. 2201.)
Burlington limestone, Louisiana, Missouri.
Figs. 27-33. LIORHYNCHUS GREENIANUM (Ulrich) p. 185
27-30. Pedicle, brachial, anterior and lateral views of a very perfect
internal cast. 31-33. Brachial, lateral and anterior views of
another specimen. (W. M., No. 13645.)
Knobstone shale, New Albany, Indiana.
Figs. 34-36. PUGNAX QUADRIROSTRIS Beede p. 204
Pedicle, brachial and lateral views of a very perfect individual (x4).
(W. M., No. 2996.)
Salem limestone, Bloomington, Indiana.
Figs. 37-42. PUGNAX WORTHENI (Hall) p. 203
37-39. Pedicle, brachial and anterior views of a large and nearly
perfect specimen. (W. M., No. 13928.)
Salem limestone, Hull's Hollow, above Alton, Illinois.
40-42. Similar views of the holotype. (A. M. N. H., No. 5064.)
Salem limestone, near Alton, Illinois.
Figs. 43-52. SHUMARDELLA MISSOURIENSIS (Shumard) p. 222
43-47. Pedicle, brachial, anterior, posterior and lateral views of a
nearly perfect specimen. 48-52. Similar views of another
specimen. (W. M., No. 9667.)
Chouteau limestone, Chouteau Springs, Missouri.
58
MONOGRAPH No. 1. PLATE XXV.
ILLINOIS STATE GEOLOGICAL SURVEY.
12 13 14
5O
51
52
EXPLANATION OF PLATE XXVI.
Figs. 1-9. SHUMARDELLA OBSOLENS (Hall) p. 224
1-3. Brachial, anterior and lateral views of a very perfect shell.
4-6. Pedicle, posterior and anterior views of another specimen.
7-9. Brachial and two lateral views of three separate specimens.
(W. M., No. 9668.)
Chouteau limestone, Chonteau Springs, Missouri.
Figs. 10-14. PARYPHORHYNCHUS ELONGATUM Weller p. 191
Pedicle, brachial, lateral, anterior and posterior views of a very per-
fect specimen. (D. K. G., No. 3901.)
Kinderhook limestone, South Fabius River, southeast cor-
ner of Kno.r County, Missouri.
Figs. 15-22. PARYPHORHYNCHUS STRIATICOSTATUM (Meek & Worthen) .p. 189
15-19. Pedicle, brachial, lateral, anterior and posterior views of a
nearly perfect specimen. (W. M., No. 10784.)
Kinderhook limestone, Pike County, Illinois.
20-22. Pedicle, brachial and lateral views of another nearly perfect
example. (W. M., No. 6658.)
Kinderhook, Bed No. 4, Burlington, Iowa.
Figs. 23-28. PARYPHORHYNCHUS TRANSVERSUM Weller p. 188
23. View of a nearly perfect pedicle valve. (W. M., No. 10548.)
Kinderhook sandstone, Kinderhook, Illinois.
24-28. Pedicle, brachial, anterior, posterior and lateral views of a
nearly perfect internal cast. (U. M., No. 1375.)
Chonopectus sandstone, Burlington, Iowa.
60
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXVI.
8
28
EXPLANATION OF PLATE XXVII.
Figs. 1-6. RHYNCHOTETRA CAPUT-TESTUDINIS (White) p. 206
1-4. Pedicle, brachial, lateral and anterior views of the holotype.
(U. M., No. 1376.)
Base of Burlington limestone, Burlington, Iowa.
5. View of an incomplete internal cast of a pedicle valve. 6. View
of an incomplete internal cast of a brachial valve. (U. M.,
No. 1376.)
Kinder ho ok, Bed No. 7, Burlington, Iowa.
Figs. 7-15. RHYNCHOTETRA GIBBOSUM (Greger) p. 211
7-10. Lateral, pedicle, brachial and anterior views of a very perfect,
small specimen. Cotype. (D. K. G., No. 3602.)
Burlington limestone, Hannibal, Missouri.
11-13. Pedicle, brachial and lateral views of a nearly perfect, large
specimen. Cotype. (D. K. G., No. 3702.)
Burlington limestone, Louisiana, Missouri.
14-15. Views of two imperfect brachial valves. (VV. M., No. 9715.)
Burlington limestone, Marion County, Missouri.
Figs. 16-20. RHYNCHOTETRA OVATUM (Greger) p. 208
16-17. Pedicle and brachial views of a nearly perfect shell.
18-20. Pedicle, brachial and lateral views of another specimen.
Cotypes. (D. K. G., No. 3802.)
Chouteau limestone, Kicsenger Bluff, Warsaw, Benton
County, Missouri.
62
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXVII.
16
18
19
EXPLANATION OF PLATE XXVIII.
Figs. 1-8. RHYNCHOTETRA MISSOURIENSIS n. sp p. 210
1-5. Pedicle, brachial, lateral, posterior and anterior views of a
nearly perfect specimen. (W. M., No. 13962.) 6. Anterior
view of a specimen. (D. K. G.) 7-8. Posterior and pedicle
views of the specimen ground for the cross-sections of the
rostral portion of the shell. (W. M., No. 13965.)
Burlington limestone, Missouri.
Figs. 9-12. RHYNCHOTETRA ELONGATUM n. sp p. 209
Pedicle, brachial, lateral and anterior views of a nearly perfect
specimen, the holotype. (W. M., No. 8549.)
Pierson limestone, near Springfield, Missouri.
Figs. 13-24. TETRACAMERA SUBCUNEATA (Hall) p. 214
13-15. Pedicle, brachial and posterior views of a very perfect speci-
men. 16-18. Pedicle, brachial and anterior views of another
specimen. 19. Brachial view of a specimen with very broad
plications. 20. Pedicle view of a specimen with very concave
postero-lateral slopes. 21-22. Brachial and lateral views of a
narrow, elongated specimen. 23-24. Pedicle and lateral views
of a very short and thick specimen. (W. M., No. 7724.)
Salem limestone, Salem, Indiana.
Figs. 25-34. TETRACAMERA ARCTIROSTRATA (Swallow) p. 215
25-29. Pedicle, brachial, lateral, anterior and posterior views of a
very perfect specimen. (D. K. G., No. 401.)
Salem limestone, Boonville, Missouri.
30-34. Similar views of another specimen. (D. K. G., No. 501.)
Salem limestone, Alton, Illinois.
Figs. 35-39. TETRACAMERA MISSOURIENSIS n. sp p. 216
35-36. Pedicle and lateral views of the internal cast of a pedicle
valve. 37-38. Brachial and lateral views of the internal cast
of a brachial valve. 39. View of the internal cast of a brachial
valve. Cotypes. (W. M., No. 14280.)
Residual chert, Callaway County, Missouri.
64
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE XXVIII.
.:>
19 20
22
23 24
25
26
27
28
29
30
31
32
33
34
35
37
39
36 38
EXPLANATION OF PLATE XXIX.
Figs. 1-13. TETRACAMERA SUBTRIGONA (Meek & Worthen) p. 218
1-5. Pedicle, brachial, lateral, posterior and anterior views of a
large specimen. 6-10. Pedicle, lateral, anterior, posterior and
brachial views of a smaller specimen. (W. M., No. 8683.)
Keokuk limestone, Warsaiv, Illinois.
11. View of an internal cast of a pedicle valve. (W. M., No. 8684.)
Chert of Burlington limestone, Louisiana, Missouri.
12. View of an internal cast of a brachial valve. (W. M., No. 320.)
Residual chert, Springfield, Missouri.
13. View of an internal cast of a pedicle valve with the matrix
broken away to show the spondylium. (W. M., No. 13927.)
Residual chert, Aurora, Missouri.
Figs. 14-18. RHYNCHOPORA PUSTULOSA (White) p. 230
Pedicle, brachial, lateral, anterior and posterior views of a very per-
fect specimen. (W. M., No. 9690.)
Kinderhook, Bed No. 4, Burlington, Iowa.
Figs. 19-30. RHYNCHOPORA HAMBURGENSIS Weller p. 228
19. View of a pedicle valve. 20-21. Views of two brachial valves.
22. Anterior view of an imperfect specimen. 23-26. Pedicle,
brachial, lateral and anterior views of a nearly perfect speci-
men. 27-30. Similar views of a smaller specimen. (W. M.,
No. 7742.)
Hamburg oolite, Kinderhook, Hamburg, Illinois.
Figs. 31-38. RHYNCHOPORA BEECHERI Greger p. 232
31-32. Pedicle and posterior views of an internal cast. 33-34. An-
terior and pedicle views of an internal cast. 35-36. Brachial
and pedicle views of an internal cast. 37-38. Brachial and ped-
icle views of an internal cast. (W. M., No. 376.)
Residual chert, Springfield, Missouri.
66
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXIX.
11
12
13
14
15 16
17
18 19
2O
23 24 25 26 27 28 29
30
38 37
36
35
34 33
32
EXPLANATION OF PLATE XXX.
Figs. 1-6. RHYNCHOPORA PERSINUATA (Winchell) p. 233
1. View of an internal cast of a pedicle valve. The holotype.
(U. M., No. 1998.) 2. Anterior view of a large internal cast,
imperfect posteriorly. (W. M., No. 6712.)
Kinderhook, Bed No. 7 , Burlington, Iowa.
3-4. Brachial and lateral views of a nearly complete specimen.
5-6. Pedicle and anterior views of another specimen. (D. K.
G., No. 1302.)
Lake Valley beds, Lake Valley, New Mexico.
Figs. 7-15. RHYNCHOPORA? COOPERENSIS (Shumard) p. 235
7-11. Pedicle, brachial, lateral, anterior and posterior views of a
nearly complete specimen. (W. M., No. 9661.)
Chouteau limestone, Chouteau Springs, Missouri.
12-15. Pedicle, brachial, lateral and anterior views of a nearly com-
plete specimen. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 16-17. RHYNCHOPORA sp.
16. View of a pedicle valve. (W. M., No. 6716.)
Burlington limestone, Burlington, Iowa.
17. View of a brachial valve probably belonging to the same species.
(W. M., No. 13958.)
Burlington limestone, Springfield, Missouri.
Figs. 18-21. RHYNCHOPORA? ROWLEYI n. sp p. 237
Pedicle, brachial, anterior and lateral views of a very perfect speci-
men. (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
Figs. 22-25. RHYNCHOPORA? COOPERENSIS (Shumard) (?) p. 235
Pedicle, brachial, posterior and lateral views of a somewhat crushed
specimen. (W. M., No. 8548.)
Pierson limestone, near Springfield, Missouri.
Figs. 26-29. CENTRONELLA LOUISIANENSIS n. sp p. 241
26-27. Pedicle and brachial views of a very perfect shell (x4).
28-29. Pedicle and brachial views of another example (x4).
(W. M., No. 6730.)
Louisiana limestone, Louisiana, Missouri.
Figs. 30-33. TRIGERIA ? CURRIEI (Rowley) p. 245
30-31. Pedicle and brachial views of a very perfect shell (x4).
32-33. Pedicle and brachial views of another specimen (x4).
(W. M., No. 6732.)
Louisiana limestone, Louisiana, Missouri.
Figs. 34-39. SELENELLA PEDICULUS (Rowley) p. 244
34-35. Pedicle and brachial views of a very perfect specimen (x4).
36-37. Similar views of another specimen (x4). 38-39. Similar
views of a third example (x4). (W. M., No. 6731.)
^Louisiana limestone, Louisiana, Missouri.
69
Figs. 40-42. CENTRONELLA ( > ) EMACIATA Rowley p. 242
Pedicle, lateral and brachial views of a nearly perfect specimen, the
holotype. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 43-55. DIELASMELLA COMPRESSA Weller p. 280
43-44, 45-46, 47-48, 49-50. Pedicle and brachial views of four differ-
ent specimens. 51. Pedicle view (x4) of specimen figured in
Figs. 49-50. 52-53. Pedicle and brachial views (x4) of speci-
men figured in Figs. 45-46. 54-55. Pedicle and brachial views
(x4) of specimen figured in Figs. 47-48. (W. M., No. 11347.)
Glen Park limestone, Glen Park, Missouri.
70
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXX.
w
i
IP
d
9
10
12 fa 14
15
16
18
19
20
24
23
26 27
28 29 3O
)
11
17
25
I
31 32 33
34 35
36 37
38 39
54
43
44 45 46 47 48 49 5O
40 41
42 51
52
53
55
EXPLANATION OF PLATE XXXI.
FigS. 1-4. DlELASMELLA CALHQUNENSIS n. Sp p. 281
1-3, Pedicle, brachial and lateral views of a nearly complete speci-
men. 4. View of a partially exfoliated pedicle valve. (W. M.,
No. 14246.)
Hamburg oolite, Kinderhook, Hamburg, Illinois.
Figs. 5-15. CENTRONELLOIDEA ROWLEYI (Worthen) p. 247
5-6. Views of a pedicle and a brachial valve, the cotypes. (I. S.
M.) 7-10. Pedicle, brachial, lateral and anterior views of a
nearly perfect specimen. 11-14. Pedicle, brachial, lateral and
posterior views of another specimen. 15. View of the brach-
idium. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 16-18. HAMBURGIA TYPA n. sp p. 283
16-17. Views of two pedicle valves. 18. View of a brachial valve.
(W. M., No. 14245.)
Hamburg oolite, Kinderhook, Hamburg, Illinois.
Figs. 19-24. DIELASMOIDES BISINUATA Weller p. 254
19-21. Pedicle, brachial and lateral views of a nearly complete speci-
men. 22-24. Similar views of a larger specimen. (D. K. G.,
No. 1704.)
Patrick's Quarry, Middle Fabius River, Lewis County, Mis-
souri.
Figs. 25-27. DIELASMA SHUMARDANUM (Miller) p. 268
Lateral, pedicle and brachial views of a nearly perfect specimen.
(W. M., No. 7770.)
Chester group, Big Hill, Jackson County, Illinois.
Figs. 28-34. DIELASMA SINUATA n. sp p. 262
28-31. Pedicle, brachial, lateral and posterior views of a nearly com-
plete internal cast, somewhat restored anteriorly. 32-33. Views
of the internal casts of two brachial valves. (W. M., No. 334.)
Residual chert, Springfield, Missouri.
34. View of the internal cast of a brachial valve, the holotype of
Lingula crawfordsvillensis Gurley. (W. M., No. 6315.)
Crawfordsville shale, Crawfordsville, Indiana.
Figs. 35-44. DIELASMA ARKANSANUM n. sp p. 269
35-37. Pedicle, brachial and lateral views of a nearly complete speci-
men. 38-40. Similar views of a smaller example. (D. K. G.,
No. 1505.)
Webb City, Missouri (Carterville formation?).
41-43. Pedicle, brachial and lateral views of a nearly complete
specimen. 44. Pedicle view of another specimen. Cotypes.
(W. M., No. 14255.)
Fayetteville, Arkansas.
Figs. 45-49. DIELASMA BURLINGTONENSIS (White) p. 261
45-47. Pedicle, brachial and lateral views of a nearly perfect but
slightly distorted specimen. 48-49. External and internal views
of a pedicle valve, imperfect anteriority. Cotypes. (U. M.,
No. 1373.)
Base of Burlington limestone, Burlington, Iowa.
72
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXI.
• I
38 39 4O
45 46 47 48 49
EXPLANATION OF PLATE XXXII.
Figs. 1-17. DIELASMA CHOUTEAUENSIS n. sp p. 257
1-4. Pedicle, brachial, lateral and anterior views of a large specimen
figured by Hall and Clarke as D. formosa. (W. M., No. 12237.)
Chouteau limestone, Missouri.
5. View of a pedicle valve. (W. M., No. 9703.)
Chouteau limestone, Pettis County, Missouri.
6-8. Pedicle, brachial and anterior views of a nearly perfect speci-
men. 9-12. Posterior, pedicle, brachial and lateral views of a
nearly perfect specimen. (W. M., No. 9666.)
Chouteau limestone, Chouteau Springs, Missouri.
13-15. Pedicle, brachial and lateral views of an imperfect specimen.
16-17. Brachial and pedicle views of another imperfect speci-
men. (W. M., No. 8547.)
Pierson limestone, near Springfield, Missouri.
Figs. 18-28. DIELASMA INFLATA n. sp p. 264
18-21. Lateral, brachial, pedicle and anterior views of a very perfect
specimen, the holotype. (W. M., No. 14235.)
Salem limestone, Barrett's Station, Missouri.
22-24. Lateral, brachial and pedicle views of a very perfect but nar-
rower specimen. (W. M., No. 7772.) 25-28. Lateral, anterior,
pedicle and brachial views of a specimen which probably be-
longs to this species. (W. M., No. 7773.)
Salem limestone, Spergen Hill, Indiana.
74
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXII.
27
2O
18
EXPLANATION OF PLATE XXXIII.
Figs. 1-3. DIELASMA OSCEOLENSIS n. sp p. 260
Pedicle, brachial and lateral views of the holotype. (W. M.,
No. 7743.)
Lower Burlington limestone, Osccola, Missouri.
Figs. 4-5. DIELASMA FERNGLENENSIS Weller p. 259
Pedicle and brachial views of the holotype. (W. M., No. 4688.)
Fern Glen formation, near Kimmswick, Missouri.
Figs. 6-11. DIELASMA SUBSPATULATUM n. sp p. 270
Pedicle, brachial and lateral views of two specimens. Cotypes.
(W. M., No. 14254.)
Washington County, Arkansas.
Figs. 12-17. DIELASMA FORMOSUM Hall p. 265
12-14. Pedicle, brachial and lateral views of the holotype of D.
obovata H. & C. (W. M., No. 12238.)
Salem limestone (?) , Kentucky.
15-17. Pedicle, brachial and lateral views of a very perfect speci-
men of typical form. (W. M., No. 449.)
Salem limestone, Spergcn Hill, Indiana.
Figs. 18-20. DIELASMA ILLINOISENSIS n. sp p. 267
Pedicle, brachial and lateral views of the holotype. (W. M., No.
14770.)
Chester Group, Paint Creek formation, near Modoc, Ran-
dolph County, Illinois.
76
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXIII.
6
15
16
17
19 2O
EXPLANATION OF PLATE XXXIV.
Figs. 1-24. GIRTYELLA iNDiANENSis (Girty) p. 275
1-9. Pedicle, brachial and lateral views of three nearly perfect
examples from the typical locality of the species. (W. M.,
Nos. 7774 and 14237.)
Pella Beds, Pella, Iowa.
10-11. Pedicle and brachial views of a nearly perfect specimen.
(W. M., No. 14338.)
Ste. Genevieve limestone, near Waterloo, Illinois.
12-17. Pedicle, brachial and lateral views of two very perfect speci-
mens probably belonging to this species. (D. K. G., No. 1603.)
Webb City, Jasper Co., Missouri. (Carterville -formation?)
18-20. Pedicle, brachial and lateral views of a small specimen.
21-24. Pedicle, brachial, lateral and anterior views of another
specimen. (W. M., No. 14800.)
Lower Chester Group, Rosiclare, Illinois.
Figs. 25-36. GIRTYELLA TURGIDA (Hall) p. 273
25-27. Pedicle, brachial and lateral views of a large specimen.
28-31. Pedicle, brachial and lateral views of two smaller speci-
mens. (W. M., No. 14234.)
Salem limestone, Blooinington, Indiana.
32-C3. Brachial and lateral views of a very convex specimen.
34-36. Pedicle, brachial and lateral views of a small indi-
vidual. (W. M., No. 14771.)
Salem limestone, Hull's Hollow, Madison Co., Illinois.
Figs. 37-41. GIRTYELLA BREVILOBATA ( Swallow) p. 278
37-39. Pedicle, brachial and lateral views of a very perfect speci-
men. (W. M., No. 7786.)
Chester Group, Golconda, Illinois.
40-41. Pedicle and brachial views of an internal cast. Holotype
of Dielasma turgida var. elongata Weller. (W. M., No. 4959.)
Batcsville sandstone, Batcsville, Arkansas.
Figs. 42-47. GIRTYELLA INTERMEDIA n. sp p. 276
42-44. Pedicle, brachial and lateral views of a very complete speci-
men in which the median plication in the brachial valve is
well developed. 45-47. Smaller views of another example
with the median plication of the brachial valve faintly de-
veloped. Cotypes. (W. M., No. 14772.)
Paint Creek Formation, near Modoc, Randolph County,
Illinois.
Figs. 48-50. GIRTYELLA CEDARENSIS n. sp p. 272
Pedicle, brachial and lateral views of an internal cast, the holo-
type. The median septum is clearly shown in the brachial
view. (D. K. G., No. 1402.)
Northview shale, Cedar Gap, Wright County, Missouri.
Fig. 51. CRAN/ENA ( ?) ALLEI (Winchell) p. 252
View of the holotype, an internal cast of the pedicle valve. (U.
M., No. 2004.)
Kinderhook, Bed No. 5, Burlington, Iowa.
79
Figs. 52-54. CRAX.-ENA sp.
Pedicle, brachial and lateral views of a nearly complete specimen.
(W. M., No. 9716.)
Chouteau limestone, Pcttis County, Missouri.
Figs. 55-59. CRAN.ENA SULCATA n. sp p. 251
55-57. Pedicle, brachial and lateral views of a very perfect speci-
men. 58-59. Brachial and anterior views of another example.
Cotypes. (W. M., No. 14250.)
Salem limestone, Spcrgen Hill, Indiana.
Figs. 60-66. CRAN^NA GLOBOSA n. sp p. 249
Pedicle, brachial and lateral views of a very perfect internal cast.
Holotype. (W. M., No. 14249.)
Upper Burlington limestone, Springfield, Missouri.
63-65. Pedicle, brachial and lateral views of another specimen.
66. View of the interior of a shell showing the brachidium.
(W. M., No. 14248.)
Burlington white chert, Louisiana, Missouri.
80
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE XXXIV.
123^
5 6
7 89
********
10 11
12 13 14 15 16 17
J J ) ,) 3
18 19 2O 21 22 23 24
25 26 27
• A
28 29 3O 31 32 33 34 35 36
mjj ^a s
37 38 39 42 43 44 45 46 47
^I^F ^^ ^^ 41
48
49 5O
51
4O
* * i
53 54 55 56 57 58
6O 61 62
63 64 65 66
EXPLANATION OF PLATE XXXV.
Figs. 1-5. ATRYPA INFREQUENS n. sp p. 285
1-2. Pedicle and brachial views of the holotype. 3-5. Pedicle,
brachial and lateral views of the same specimen enlarged x 2.
(W. M., No. 11348.)
Glen Park limestone, Glen Park, Missouri.
Figs. 6-21. CYRTINA ACUTIROSTRIS (Shumard) p. 286
6-10. Pedicle, brachial, lateral, anterior and posterior views of a
perfect specimen. 11-15. Similar views of another specimen.
16-20. Similar views of a third example. 21. View of the
interior of a pedicle valve showing the median septum. (W.
M., No. 6691.)
Louisiana limestone, Louisiana, Missouri.
Figs. 22-31. CYRTINA BURLINGTONENSIS Rowley.... p. 288
22-26. Pedicle, brachial, lateral, anterior and posterior views of
a perfect specimen. (W. M., No. 9676.)
Choutcau limestone, Peltis County, Missouri.
27-30. Pedicle, brachial, lateral and anterior views of the holo-
type. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
31. View of an internal cast of a pedicle valve showing the
median septum as a slit. (R. R. R.)
Burlington chert, Louisiana, Missouri.
Figs. 32-38. CYRTINA NEOCENES Hall and Clarke p. 289
32-36. Pedicle, brachial, anterior, posterior and lateral views of
a nearly complete internal cast. 37-38. Views of two internal
casts of pedicle valves. (W. M., No. 5638.)
Residual chert, Springfield, Missouri.
Figs. 39-40. SPIRIFERINA sp.
Pedicle and brachial views of a somewhat crushed specimen. (W.
M., No. 7531.)
Keokuk limestone, Keokuk, Iowa.
Figs. 41-49. SPIRIFERINA TRANSVERSA (McChesney) p. 297
41-44. Pedicle, brachial. anterior and posterior views of a very
perfect specimen. 45-48. Similar views of another example.
49. View of the interior of a pedicle valve showing the dental
lamellae and median septum. (W. M., No. 7507.)
Chester Group, Chester, Illinois.
Figs. 50-58. SPIRIFERINA SPINOSA (Norwood and Pratten) p. 299
50-53. Pedicle, brachial, anterior and posterior views of a nearly
perfect specimen. (W. M., No. 7496.)
Chester Group, Randolph County, Illinois.
54-58. Pedicle, brachial, anterior, posterior and lateral views of
another specimen. (W. M., No. 7498.)
Chester Group, Monroe County, Illinois.
83
Figs. 59-63. SPIRIFERELLA (?) SCHUCHERTI (Rowley) p. 416
Pedicle, brachial, lateral, posterior and anterior views of a very
perfect specimen. Metatype. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 64-72. ACANTHOSPIRA ACICULIFERA (Rowley) p. 413
64-67. Pedicle, brachial, lateral and anterior views of the holotype.
68-71. Pedicle, brachial, lateral, posterior and anterior views
of the same specimen enlarged (x 4). (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
84
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXV.
J
9
11
12
13 14
'6
21
16
22
23 24 25 26
32
27
28 29 30
31 34
10
15
17 18 iQ 20
33
'
"•IS
35
62 63
68
EXPLANATION OF PLATE XXXVI.
Figs. 1-5. SPIRIFERINA SALEMENSIS n. sp p. 296
Pedicle, brachial, lateral, posterior and anterior views of the holo-
type. (W. M., No. 13948.)
Salem limestone, Bloomington, Indiana.
Figs 6-7. DELTHYRIS CLARKSVILLENSIS (Winchell) p. 301
6. View of a pedicle valve. 7. Brachial view of a somewhat
crushed specimen. (W. M., No. 6699.)
Louisiana limestone, Louisiana, Missouri.
Fig. 8. DELTHYRIS SUBORBICULARIS Weller p. 303
View of a pedicle valve, the holotype. (W. M., No. 11352.)
Glen Park limestone, Glen Park, Missouri.
Figs. 9-14. DELTHYRIS MISSOURIENSIS Weller p. 302
9. View of a pedicle valve. 10. View of a brachial valve. (W.
M., No. 14276.)
Hamburg oolite, Calhoun County, Illinois.
11-12. Views of two pedicle valves. 13-14. Views of two brachial
valves. Cotypes. (W. M., No. 11351.)
Glen Park limestone, Glen Park. Missouri.
Figs. 15-24. DELTHYRIS NOVAMEXICANA (Miller) p. 304
15-16. Views of two imperfect pedicle valves. 17. Posterior view
of an incomplete specimen. Cotypes of S. magnicostata Weller.
(W. M., No. 4690.)
Fern Glen formation, near Kimmswick, Missouri.
18-19. Pedicle and posterior views of an incomplete specimen.
20-21. Pedicle and brachial views of a smaller incomplete
specimen. 22-24. Pedicle, anterior and posterior views of a
third specimen. (D. K. G.)
Lake Valley beds, Lake Valley, New Mexico.
Figs. 25-34. SPIRIFERINA SOLIDIROSTRIS White p. 292
25. View of a pedicle valve. 26-27. Views of two brachial valves.
28. Brachial view of a somewhat crushed specimen. Cotypes.
(U. M., No. 1372.)
Kinderhook, Bed No. 7, Burlington, Iowa.
29. View of the interior of a pedicle valve showing the median
septum. 30. View of a pedicle valve. 31-32. Pedicle and
posterior views of a pedicle valve. 33-34. Views of two im-
perfect brachial valves. (W. M., No. 13949.)
Kinderhook, Le Grand, Iowa.
Figs. 35-40. SPIRIFERINA SUBTEXTA White p. 291
35-39. Pedicle, brachial, anterior, posterior and lateral views of
the holotype. (U. M., No. 1701.)
Burlington limestone, Burlington, Iowa.
40. View of a pedicle valve. (W. M., No. 13914.)
Fern Glen formation, near Kimmswick, Missouri.
87
Figs. 41-48. SPIRIFERINA NORWOODANA (Hall) p. 295
41-44. Posterior, lateral, brachial and pedicle views of a nearly
perfect specimen (x 4). 45-48. Pedicle, brachial, lateral and
anterior views of a nearly perfect specimen. (x 4.) (W.
M., No. 5636.)
Salem limestone, Blooiiiington, Indiana.
Figs. 49-53. DELTHYRIS SIMILIS n. sp p. 305
Pedicle, brachial, anterior, lateral and posterior views of a nearly
perfect internal cast, the holotype. ( D. K. G., No. 2903.)
Residual chert, South Branch, Callaway Co., Missouri.
Figs. 54-57. SPIRIFERINA SUBELLIPTICA (McChesney) p. 294
54-55. Pedicle and brachial views of a sulphur cast of the holo-
type. (W. M., No. 13239.)
Button Mould Knob, Kentucky.
56. View of a pedicle valve. 57. View of the interior of a ped-
icle valve showing the median septum. (W. M., No. 13427.)
Lebanon, Kentucky.
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXVI.
6
15
18
25
3O
35
10
16
17
19
20 21
22
26
27
28
29
31
32
33
34
36 37
38
•M
39
45
46
48
44
>
fl
49
5O
51
52
11
13 12
23
24
40
41 42
43
i
53
EXPLANATION OF PLATE XXXVII.
Figs. 1-7. SPIRIFER MARIONENSIS Shumard p. 30.S
1-5. Pedicle, brachial, anterior, posterior and lateral views of a
nearly perfect specimen. (W. M., No. 6700.)
Louisiana limestone, Clarksvillc, Missouri.
6. View of a pedicle valve with much extended hinge-line. (W.
M., No. 13335.) 7. Brachial view of a specimen with very
short hinge-line. (W. M., No. 6694.)
Louisiana limestone, Louisiana, Missouri.
Figs. 8-17. SPIRIFER VERNONENSIS Swallow p. 310
8-12. Posterior, pedicle, brachial, anterior and lateral views of a
very perfect specimen. 13. View of a large pedicle valve.
(W. M., No. 4686.)
Fern Glen formation, near Kiminswick, Missouri,
14-17. Pedicle, brachial, anterior and posterior views of a nearly
perfect specimen. (W. M., No. 13535.)
Fern Glen formation, Fern Glen, Missouri.
Figs. 18-21. SPIRIFER OSAGENSIS Swallow p. 314
18-19. Views of two imperfect pedicle valves. 20. View of a
brachial valve. (W. M., No. 13545.)
Hannibal sandstone, Louisiana, Missouri.
21. View of a brachial valve. (W. M., No. 5957.)
Northvicw sandstone, Northview, Missouri.
90
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXVII.
13
EXPLANATION OF PLATE XXXVIII.
Figs. 1-5. SPIRIFER PIKENSIS Rowley p. 312
Pedicle, brachial, anterior, posterior and lateral views of the holo-
type. (R. R. R.)
Burlington limestone, Louisiana, Missouri.
Figs. 6-8. SPIRIFER SHEPARDI n. sp p. 313
6-7. Views of two pedicle valves. 8. View of a brachial valve.
Cotypes. (W. M., No. 8540.)
Pierson limestone, near Springfield, Missouri.
Figs. 9-13. SPIRIFER LATIOR Swallow p. 316
Lateral, pedicle, brachial, anterior and posterior views of a nearly
perfect specimen. (W. M., No. 6707.)
Chouteau limestone, Chouteau Springs, Missouri.
92
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XXXVIII.
12
13
EXPLANATION OF PLATE XXXIX.
Figs. 1-10. SPIRIFER PLATYNOTUS n. sp p. 317
1. View of a pedicle valve. 2. View of a brachial valve. (W. M.,
No. 6674.) 3-5. Views of three pedicle valves. 6. View of a
brachial valve. Cotypes. (W. M., No. 13544.)
Kinderhook, Bed No. 6, Burlington, Iowa.
7-10. Pedicle, brachial, anterior and lateral views of a nearly per-
fect specimen probably belonging to this species. (W. M.,
No. 7502.)
Kinderhook, Bed No, 5, Burlington, Iowa.
Figs. 11-23. SPIRIFER MISSOURIENSIS Swallow p. 319
11-14. Posterior, lateral, pedicle and brachial views of a nearly per-
fect example showing the distinct fasciculation of the plications.
(W. M., No. 10719.)
Chouteau limestone, Pettis County, Missouri.
15-18. Pedicle, brachial, anterior and posterior views of a nearly
perfect specimen. 19-23. Posterior, lateral, pedicle, brachial
and anterior views of a large specimen somewhat restored at the
cardinal extremities. (W. M., No. 9663.)
Chouteau limestone, Chouteau Springs, Missouri.
Figs. 24-26. SPIRIFER BIPLICATUS Hall p. 320
24-25. Views of two internal casts of pedicle valves. 26. View of
the internal cast of a brachial valve. (W. M., No. 5931.)
Chonopectus sandstone, Burlington, lozva.
Figs. 27-30. SPIRIFER BIPLICOIDES n. sp p. 323
27. View of a plaster cast of the pedicle valve from a natural
mould. 28. View of the internal cast of a brachial valve.
(W. M., No. 6660.) 29. View of a plaster cast from a natural
mould of the pedicle valve. (W. M., No. 14785.) 30. View of
the internal cast of a brachial valve. (W. M., No. 14755.)
Kinderhook, Bed No. 5, Burlington, Iowa.
94
ILLINOIS STATE GEOLOGICAL SURVEY.
A^ONOGRAPH No. 1. PLATE XXXIX.
11
I I •
23
EXPLANATION OF PLATE XL.
Figs. 1-23. SPIRIFER LOUISTANENSIS Rowley p. 322
1-5. Pedicle, brachial, lateral, anterior and posterior views of a
nearly complete specimen. 6-10. Similar views of another
specimen. 11-13. Brachial, lateral and posterior views of
another specimen. (W. M., No. 5632.)
Chouteau limestone, Green County, Missouri.
14-15. Views of two pedicle valves. (W. M., No. 14153.)
Head of Middle River, Callaway County, Missouri.
16-19. Pedicle, brachial, lateral and anterior views of a nearly per-
fect specimen. 20-23. Pedicle, brachial, lateral and posterior
views of a nearly perfect specimen. Metatypes. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 24-29. SPIRIFER LEGRANDENSIS n. sp p. 326
24-28. Pedicle, brachial, anterior, lateral and posterior views of a
very perfect specimen. 29. View of a pedicle valve. Cotypes.
(W. M., No. 10720.)
Kinderhook, LeGrand, Iowa.
Figs. 30-34. SPIRIFER INSCULPTUS Rowley p. 324
Pedicle, anterior, posterior, lateral and brachial views of a nearly
perfect specimen. (W. M., No. 13551.)
Base of Burlington limestone, Fern Glen, Missouri.
96
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XL.
8
10
11
16
20
12
13
21
>
- :
17 18
19
f
22
23
14
15
25
28
27
30
29
33
34
EXPLANATION OF PLATE XLI.
Figs. 1-5. SPIRIFER INSCULPTUS Rowley p. 324
Pedicle, brachial, posterior, anterior and lateral views of the holo-
type. (R. R. R.)
Lower Burlington limestone, Louisiana, Missouri.
Figs. 6-14. SPIRIFER INCERTUS Hall p. 335
6. View of a nearly perfect pedicle valve. (W. M., No. 13529.)
7-11. Lateral, pedicle, brachial, posterior and anterior views of
a nearly perfect specimen. (W. M., No. 8620.) 12-14. Bra-
chial, posterior and pedicle views of the holotype. (A. M.
N. H., No. 5111—1.)
Burlington limestone, Burlington, Iowa.
98
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLI.
r t
3
12
EXPLANATION OF PLATE XLII.
Figs. 1-3. SPIRIFER FORBESI Norwood and Pratten p. 331
Pedicle, brachial and posterior views of a nearly perfect specimen
probably belonging to this species. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 4-16. SPIRIFER TENUICOSTATUS Hall p. 328
4. View of a pedicle valve. 5-9. Pedicle, brachial, anterior, poste-
rior and lateral views of a nearly perfect specimen. Cotypes.
(A. M. N. H., No. 5121—1 & 2.)
Warsaw formation, Dallas and Warsaw, Illinois.
10-13. Pedicle, brachial, posterior and anterior views of a some-
what distorted specimen. (W. M., No. 7506.)
Keokuk limestone, Bentonsport, Iowa.
14-16. Lateral, pedicle and brachial views of a somewhat crushed
specimen. (W. M., No. 7505.)
Warsaiv formation, Warsaw, Illinois.
Figs. 17-21. SPIRIFER JEFFERSONENSIS Weller p. 369
17-18. Pedicle and posterior views of an incomplete pedicle valve.
19-21. Views of three brachial valves. Cotypes. (W. M., No.
11350.)
Glen Park limestone, Glen Park, Missouri.
100
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No.- 1. PLATE jX
4 m
16
EXPLANATION OF PLATE XLIII.
Figs. 1-10. SPIRIFER SUB^EQUALIS Hall p. 327
1-5. Pedicle, brachial, posterior, anterior and lateral views of a
nearly perfect specimen. (D. K. G., No. 3501.)
Webb City, Jasper Co., Missouri.
6-10. Pedicle, brachial, lateral, posterior and anterior views of a
sulphur cast of the holotype. (W. M., No. 14773.)
Warsaw limestone, Warsaw, Illinois.
Figs. 11-15. SPIRIFER LATERALIS Hall p. 330
Pedicle, brachial, posterior, anterior and lateral views of the holo-
type. (W. M., No. 8619.)
Clifton, Madison County, Illinois.
Fig. 16. SPIRIFER FORBESI Norwood and Pratten p. 331
View of a pedicle valve. (W. M., No. 13549.)
Burlington limestone, Pettis County, Missouri.
Fig. 17. SPIRIFER IMBREX Hall p. 334
View of a brachial valve, the holotype. (A. M. N. H., 5110 — 1.)
Burlington limestone, Burlington, Iowa.
102
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLIII.
EXPLANATION OF PLATE XLIV.
Figs. 1-14. SPIRIFER WASHINGTONENSIS n. sp p. 339
1-4. Pedicle, brachial, lateral and posterior views of a nearly com-
plete specimen. 5-7. Posterior, pedicle and anterior views of
another specimen. 8-9. Brachial and lateral views of a third
specimen. Cotypes. (W. M., No. 13550.)
Keokuk limestone, Monroe County, Illinois.
10-12. Anterior, pedicle and brachial views of a nearly complete
specimen. Cotypes. (W. M., No. 7522.)
Keokuk limestone, Spergen Hill, Indiana.
13-14. Pedicle and brachial views of a nearly complete specimen.
Cotypes. (W. M., No. 13577.)
Keokuk limestone, Salem, Indiana.
Figs. 15-19. SPIRIFER MUNDULUS Rowley p. 333
15-18. Pedicle, brachial, posterior and anterior views of a very per-
fect shell. Metatype. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
19. View of an incomplete pedicle valve. (W. M., No. 5635.)
Burlington limestone, near Springfield, Missouri.
Figs. 20-24. SPIRIFER BRECKENRIDGENSIS n. sp p. 342
20-22. Brachial, lateral and anterior views of a very perfect speci-
men. 23-24. Pedicle and posterior views of another specimen.
(D. K. G., No. 3302.)
Chester Group, Breckenridge County, Kentucky.
104
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLIV.
? iS^Bi^. •• i \\
.
24
EXPLANATION OF PLATE XLV.
Figs. 1-31. SPIRIFER PELLAENSIS n. sp p. 340
1-3. Pedicle, brachial and anterior views of a large specimen.
4-7. Pedicle, brachial, posterior and anterior views of another
specimen.
8-9. Pedicle and brachial views of a very large specimen.
10-11. Brachial and anterior views of a nearly perfect specimen.
12-14. Brachial, pedicle and lateral views of a nearly perfect
specimen. (W. M., No. 13571.)
Pella Beds, Pella, Iowa.
15-16. Posterior and anterior views of a specimen with a short
hinge-line. (W. M.)
Pella Beds, Iowa.
17-18. Pedicle and brachial views of a nearly perfect specimen.
19-21. Lateral, brachial and pedicle views of a nearly perfect
specimen. (W. M., No. 5771.)
Pella Beds, Fort Dodge, Iowa.
22-23. Brachial and posterior views of a nearly perfect specimen,
the holotype. 24-25. Posterior and lateral views of another
specimen. (W. M., No. 7535.)
Pella Beds, Keosauqua, Iowa.
26-27. Pedicle and brachial views of a nearly perfect specimen.
28-29. Pedicle and brachial views of another specimen. (W.M.,
No. 7247.)
Maxville limestone, Fayette County, Pennsylvania.
30. View of an internal cast of a pedicle valve. 31. View of an
internal cast of a brachial valve. (W. M., No. 338.)
Residual chert, Springfield, Missouri.
106
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLV.
EXPLAXATIOX OF PLATE XLYL
Figs. 1-12. SKUDFIX IXTOEKSCEXS Han
1-5. ffeflkfe. bradnaL latent, posterior and anterior views of a
very perfect rprriwtn. 6-ft. Pedicle. hndnaL posterior and
anterior riem^ <of anoKner ^crinM&. 10-12. Pedkle. hfadnal
«f a snaffler speeinen. (\V. 1L. X«v 75B9.)
/ . - - ' /;.-. .•-
IMI. SrvinK cuotxAn-s Rowfcy ............................. p. 336
LateraL pedade. ImciaaL posterior and anterior views of a nearhr
Mdatrpe. CR. R. R.)
•
JLJJXOIS STATE GEOLOGICAL Sewer,
1, PLATT XLVL
IT
EXPLANATION OF PLATE XLVII.
Figs. 1-5. SPIRIFER CRAWFORDSVILLENSIS n. sp p. 338
Pedicle, brachial, lateral, posterior and anterior views of the holo-
type. (W. M., No. 13528.)
Crawfordsville shale, Crawfordsville, Indiana.
Figs. 6-16. SPIRIFER BIFURCUTUS Hall p. 346
6-8. Pedicle, posterior and lateral views of a nearly complete speci-
men. 9-10. Views of two pedicle valves. (W. M., No. 14784.)
Salem limestone, Hull's Hollow, near Alton,, Illinois.
11-14. Pedicle, brachial, anterior and lateral views of a nearly
perfect specimen. 15-16. Brachial and lateral views of another
specimen. (W. M., No. 7530.)
Salem limestone, Spergen Hill, Indiana.
Figs. 17-31. SPIRIFER LEIDYI Norwood and Pratten p. 345
17-19. Pedicle, brachial and anterior views of a very perfect speci-
men. 20-22. Brachial, posterior and lateral views of a large
specimen. 23-27. Pedicle, brachial, anterior, posterior and lat-
eral views of a perfect specimen. 28-29. Pedicle and brachial
views of another example. 30-31. Lateral and brachial views
of a nearly perfect specimen. (W. M., No. 7511.)
Chester Group, Chester, Illinois.
110
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLVII.
3O
EXPLANATION OF PLATE XLVIII.
Figs. 1-5. SPIRIFER TENUIMARGINATUS Hall p. 355
Pedicle, brachial, lateral, posterior and anterior views of a sulphur
cast of the holotype. (W. M., No. 14774.)
Keokiik limestone, Warsaw, Illinois.
Figs. 6-16. SPIRIFER ROSTELLATUS Hall p. 353
6-10. Pedicle, brachial, posterior, anterior and lateral views of the
holotype. (W. M., No. 6930.)
Keokuk limestone, Warsaw, Illinois.
11-14. Pedicle, brachial, anterior and lateral views of an internal
cast of a rather broad specimen. (D. K. G., No. 3201.)
Residual chert, Richland Creek, Callaway Co., Missouri.
15-16. Pedicle and brachial views of an imperfect internal cast.
(YY. M., No. 339.)
Residual chert, Springfield, Missouri.
Figs. 17-21. SPIRIFER STRIATIFORMIS Meek p. 364
17-20. Pedicle, brachial, anterior and lateral views of a nearly per-
fect specimen. (W. M., No. 13578.)
Waverly Group, Medina, Ohio.
21. Mew of an imperfect pedicle valve. (W. M., No. 5676.)
Choutcan limestone, Green County, Missouri.
112
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLVIII.
EXPLANATION OF PLATE XLIX.
Figs. 1-14. SPIRIFER KEOKUK Hall p. 350
1-4. Pedicle, brachial, anterior and lateral views of a nearly com-
plete specimen. 5-9. Pedicle, brachial, lateral, posterior and
anterior views of another specimen. (W. M., No. 13519.)
10-14. Posterior, lateral, brachial, pedicle and anterior views of
a third specimen. (W. M., No. 5626.)
Keokuk limestone, Keokuk, Iowa.
Figs. 15-19. SPIRIFER FLOYDENSIS n. sp p. 351
15-16. Brachial and lateral views of one of the cotypes. (W. M.
No. 13526.)
Knobstone formation, Indiana.
17-19. Brachial, anterior and lateral views of another cotype.
(W. M., No. 13525.)
Knobstone formation, Floyd County, Indiana.
114
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE XLIX.
S' \
18
17
EXPLANATION OF PLATE L.
Figs. 1-5. SPIRIFER LITTONI Swallow p. 348
Pedicle, brachial, lateral, posterior and anterior views of a very
perfect specimen. (W. M., No. 14775.)
St. Louis limestone, Alton, Illinois.
Figs. 6-12. SPIRIFER INDIANENS'IS n. sp p. 352
6-10. Pedicle, brachial, lateral, posterior and anterior views of a
partially restored specimen. 11-12. Views of two pedicle valves.
Cotypes. (W. M., No. 7493.)
Harrodsburg limestone, Spergen Hill, Indiana.
Figs. 13-14. SPIRIFER MARSHALLENSIS n. sp p. 349
Views of two brachial valves. Cotypes. (W. M., No. 13541.)
Kinderhook, LeGrand, Iowa.
Figs. 15-22. SPIRIFER SUBROTUNDUS n. nom p. 356
15-18. Pedicle, brachial, lateral and anterior views of a nearly com-
plete specimen. (W. M., No. 8618.) 19-22. Pedicle, brachial,
lateral and anterior views of another specimen. (W. M.,
No. 5932.)
Chonopectus sandstone. Burlington. loi^a.
116
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE L.
3
r-.
13
12
EXPLANATION OF PLATE LI.
Figs. 1-2. SPIRIFER GRIMESI Hall p. 361
Pedicle and brachial views of a large and nearly complete speci-
men. (W. M., No. 12942.)
Burlington limestone, Springfield, Missouri.
Figs. 3-8. SPIRIFER MAPLENSIS n. sp p. 357
3-6. Views of four different pedicle valves. 7-8. Views of two
brachial valves. (W. M., No. 10580.)
English River Grit, Kinderhook, Maple Mill, Washington
County, Iowa.
118
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LI.
EXPLANATION OF PLATE LII.
Figs. 1-4. SPIRIFER GRIMESI Hall p. 361
1-3. Anterior, posterior and lateral views of the specimen illus-
trated on Plate LI, Figs. 1 and 2. (W. M., No. 12942.) 4. View
of a pedicle valve in the usual condition of preservation. (\Y.
M., No. 331.)
Burlington limestone, Springfield, Missouri.
Figs. 5-11. BRACK YTHYRIS FERNGLENENSIS Weller p. 372
5. Lateral view of a pedicle valve. 6. View of another pedicle
valve. Cotypes. (W. M., No. 13538.) 7-11. Pedicle, brachial,
lateral, anterior and posterior views of a nearly perfect speci-
men. (D. K. G., No. 3101.)
Fern Glen formation, Fern Glen, Missouri.
120
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LII.
EXPLANATION OF PLATE LIII.
Figs. 1-2. SPIRIFER GRIMES: Hall p 3^
1. Interior view of a pedicle valve. (W. M., No. 10762.) 2. View
of an incomplete pedicle valve with the plications not worn,
showing bifurcation. (W. M., No. 14786.)
Burlington limestone, near Springfield, Missouri.
Figs. 3-6. SPIRIFER ROWLEYI n. sp _ p 350
3-4. Pedicle and brachial views of a nearly complete specimen.
5. Lateral view of another example. (W. M., No. 14783.)
Lake Valley Beds, Lake Valley, New Mexico.
6. View of a worn pedicle valve. (W. M., No. 13919.)
Fern Glen formation, Fern Glen, Missouri.
Fig. 7. SPIRIFER sp.
Pedicle view of a nearly complete specimen. (W. M., No. 5653.)
Keokuk limestone, near Springfield, Missouri.
Figs. 8-9. BRACHYTHYRIS BURLINGTONENSIS n. sp p. 371
8. View of a plaster cast from a natural mould, partially restored.
9. View of the natural internal cast of the same specimen.
Cotypes. (W. M., No. 13543.)
Kinderhook, Bed No. 5, Burlington, Iowa.
122
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LIII.
EXPLANATION OF PLATE LIV.
Figs. 1-4. SPIRIFER ROWLEYI n. sp p. 360
Pedicle, brachial, posterior and lateral views of the holotype.
(W. M., No. 13537.)
Fern Glen formation, Fern Glcn3 Missouri.
Figs. 5-10. SPIRIFER CALVINI n. sp p. 368
5. View of a pedicle valve. Cotype. (W. M., No. 13542.)
Kindcrhook, Tauia County, Iowa.
6-9. Pedicle, anterior, posterior and lateral views of a nearly
perfect specimen. 10. View of a brachial valve. Cotypes.
(\V. M., No. 13540.)
Kinderhook, Lc Grand, Iowa.
ILLINOIS .STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LIV.
EXPLANATION OF PLATE LV.
Figs. 1-8. SPIRIFER GREGERI n. sp • p. 359
1-2. Views of two pedicle valves with the shell partially removed.
3. Posterior view of another specimen. Cotypes. (W. M.,
No. 13552.)
Summit of Choutcau limestone, Scdalia, Missouri.
4. View of a pedicle valve retaining the shell. Cotype. (W. M.,
No. 13578.)
Upper Chouteau, Head of Middle River, Callaway Co.,
Missouri.
5-8. Pedicle, brachial, lateral and anterior views of a nearly
complete small specimen. (D. K. G., No. 3401.)
Chouteau limestone, Newark, Knox County, Missouri.
Fig. 9. SPIRIFER MONTGOMERYENSIS n. sp p. 367
View of a pedicle valve, the holotype. (W. M., No. 13330.)
Kcokuk, Crawfordsi'illc, Indiana.
126
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LV.
EXPLANATION OF PLATE LVI.
Figs. 1-3. SPIRIFER LOGANI Hall p. 363
Pedicle, brachial and anterior views of a nearly complete speci-
men. (W. M., No. 6579.)
Kcokitk limestone, Keokuk, loii'a.
128
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LVI.
EXPLANATION OF PLATE LVII.
Figs. 1-3. SPIRIFER LOGANI Hall p. 363
1-2. Posterior and lateral views of the specimen illustrated on
Plate LVI. 3. View of the interior of the pedicle valve of
the same specimen. (W. M., No. 6579.)
Kcokuk limestone, Keokuk, Iowa.
Figs. 4-11. BRACHYTHYRIS CHOUTEAUENSIS Weller p. 373
4-7. Pedicle, brachial, posterior and lateral views of a nearly
complete specimen. (W. M., No. 8544.)
Pierson limestone, near Springfield, Missouri.
8-10. Lateral, pedicle and brachial views of a nearly complete
specimen. Holotype. (W. M., No. 9664.)
Chouteau limestone, Choutcau Springs, Missouri.
11. Brachial view of a somewhat crushed specimen. (W. M.,
No. 13536.)
Fern Glen formation, Fern Glen, Missouri.
Fig. 12. BRACHYTHYRIS PECULIARIS ( Shumard ) p. 381
View of a broad pedicle valve. (W. M., No. 9722.)
Chouteau limestone, Pettis County, Missouri.
130
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LVII.
9
10
12
11
EXPLANATION OF PLATE LVIII.
Figs. 1-3. SPIRIFER MORTONANUS Miller p. 366
1-2. Views of two pedicle valves. (W. M., No. 13328.) 3. Pos-
terior view of a nearly complete specimen. (W. M.. No. 13521.)
Crawfordsi'illc Beds, Crawfordsiillc, Indiana.
Figs. 4-8. BRACHYTH YRIS GURLEYI n. sp p. 377
Pedicle, brachial, anterior, posterior and lateral views of the
holotype. (W. M., No. 7550.)
Salon limestone, Indiana.
Figs. 9-20. BRACK YTHYRIS PECULIARIS (Shumard) p. 381
9-12. Pedicle, brachial, anterior and lateral views of a very per-
fect specimen. 13-16. Pedicle, brachial, posterior and lateral
views of another specimen. (W. M., No. 9662.)
Chouteau limestone, Choutcau Springs, Missouri.
17-20. Pedicle, brachial, anterior and posterior views of a very
narrow specimen. (W. M., No. 7941.)
Chouteau limestone, Pcttis County, Missouri.
132
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LVIII.
20
13
14
15
16
EXPLANATION OF PLATE LIX.
Figs. 1-6. SPIRIFER MORTONANUS Miller p. 366
1-3. Pedicle, brachial and lateral views of a nearly perfect
specimen. (W. M., No. 13328.) 4-6. Pedicle, posterior and
anterior views of a nearly complete specimen. (W. M., No.
13321.)
Crawfordsville beds, Crawfordsville, Indiana.
Figs. 7-14. BRACHYTHYRIS ALTONENSIS n. sp p. 379
7-10. Pedicle, brachial, anterior and posterior views of a very per-
fect internal cast. 11-14. Pedicle, brachial, lateral and an-
terior views of another specimen. Cotypes. (W. M., No.
10925.)
St. Louis limestone, i mile above Alton, Illinois.
Figs. 15-19. BRACHYTHYRIS SEMIPLICATA (Hall) p. 380
Pedicle, brachial, anterior, lateral and posterior views of a nearly
perfect specimen. (W. M., No. 14776.)
Kinderhook, 3^/2 miles N. W. of Joncsboro, Illinois.
134
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LIX.
3
.)
8
1O
12
14
17
18
9
11
*
13
15
16
19
EXPLANATION OF PLATE LX.
Figs. 1-15. BRACHYTHYRIS SUBCARDIIFORMIS Hall p. 376
1-3. Pedicle, lateral and brachial views of a sulphur cast of the
holotype. (W. M., No. 14213.)
Salon limestone, above Alton, Illinois.
4-6. Pedicle, lateral and brachial views of a large specimen. (W.
M., No. 8617.)
Edwardsville, Indiana.
7-11. Pedicle, brachial, posterior, lateral and anterior views of a
nearly perfect specimen. (W. M., No. 6352.) 12. Posterior
view of a pedicle valve showing the raised margins of the
true cardinal area. (W. M.) 13-14. Posterior and pedicle
views of a large pedicle valve. 15. Anterior view of another
specimen. (W. M., No. 7520.)
Salem limestone, Spcrgcn Hill, Indiana.
136
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LX.
EXPLANATION OF PLATE LXI.
Figs. 1-8. BRACHYTHYRIS SUBORBICULARIS Hall p. 374
1-2. Pedicle and brachial views of a sulphur cast of the holotype.
(W. M., No. 14217.)
Keokuk limestone, Kcokuk, Iowa.
3. View of a large pedicle valve. (W. M., No. 13409.) 4. Ped-
icle view of another specimen. (W. M., No. 8627.)
Keokuk limestone, Keokuk, lozva.
5. View of a brachial valve. (W. M., No. 385.) 6. View of
another pedicle valve. (W. M., No. 5655.)
Burlington limestone, Springfield, Missouri.
7. View of an incomplete brachial valve. 8. View of an incom-
plete pedicle valve. (W. M., No. 13324.)
Crawfcrdsrillc beds, Crawfordsville, Indiana.
138
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXI.
a
EXPLANATION OF PLATE LXII.
Figs. 1-12. BRACHYTHYRIS SUBORBICULARIS (Hall) p. 374
1-5. Pedicle, brachial, posterior, anterior and lateral views of a
nearly complete example. (W. M., No. 4721.)
Burlington limestone, near Sulphur Springs, Missouri.
6-10. Pedicle, brachial, lateral, posterior and anterior views of a
nearly perfect internal cast. (W. M., No. 5652.)
Residual chert, Springfield, Missouri.
11. View of a pedicle valve. (W. M., No. 13324.)
Crawfordsville beds, Crawfordsville, Indiana.
12. View of a small pedicle valve. (W. M., No. 13325.)
Crawfordsz'ille beds, Offield Creek, near Crawfordst'ille,
Indiana.
140
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXII.
12
EXPLANATION OF PLATE LXIII.
Figs. 1-4. CYRTIA INEXPECTANS n. sp p. 383
1. Posterior view showing the cardinal area with covered delthy-
ris. A wax impression from the natural mould of the holo-
type. 2-4. Posterior, pedicle and lateral views of an im-
perfect internal cast of a pedicle valve, the holotype. (W.
M., No. 381.)
Residual chert, Springfield, Missouri.
Figs. 5-8, SPIRIFERELLA PLENA (Hall) p. 412
5-7. Pedicle, brachial and posterior views of a nearly perfect
specimen. (W. M., No. 7053.)
Burlington limestone, Quincy, Illinois.
8. View of the interior of a pedicle valve showing the strongly
developed dental lamellae. (W. M., No. 7548.)
Burlington limestone, Burlington, Iowa.
Figs. 9-10. SPIRIFERELLA LATIOR n. sp. p. 414
9. View of a nearly complete pedicle valve, the holotype. (W.
M., No. 13566.)
Burlington limestone, Springfield, Missouri.
10. View of the interior of an incomplete pedicle valve. (W.
M., No. 13570.)
Burlington limestone, Osccola, Missouri.
142
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXIII.
10
EXPLANATION OF PLATE LXIV.
Figs. 1-4. SPIRIFERELLA PLENA (Hall) p. 412
1-2. Anterior and lateral views of the nearly perfect specimen
shown on Plate LXIII, Figs. 5-7. (W. M., No. 7053.)
Burlington limestone, Quincy, Illinois.
3-4. Posterior and pedicle views of a nearly complete internal
cast. (W. M., No. 13554.)
Residual chert, Sedalia, Missouri.
Figs. 5-9. SPIRIFERELLA NEGLECTA (Hall) p. 415
5-8. Pedicle, lateral, brachial and anterior views of a small hut
nearly complete specimen. (W. M., No. 8616.)
Kcokuk limestone, Edwardsville, Indiana.
9. View of a nearly perfect internal cast of a pedicle valve, show-
ing the elongate dental lamellae. (W. M.. No. 5650.)
Residual chert, Springfield, Missouri.
144
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXIV.
EXPLANATION OF PLATE LXV.
Figs. 1-4. SPIRIFERELLA NEGLECTA (Hall) p. 415
1-3. Brachial, pedicle and anterior views of a sulphur cast of a
nearly perfect specimen. (W. M., No. 14212.) 4. Posterior
view of a nearly perfect specimen. (W. M., No. 13323.)
Kcokuk limestone, Keoknk, Iowa.
Figs. 5-9. PSEUDOSYRINX MISSOURIENSIS n. sp p. 406
Anterior, posterior, lateral, pedicle and brachial views of the holo-
type, a nearly complete specimen. (W. M., No. 13559.)
Burlington limestone, Osceola, Missouri.
146
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXV.
EXPLANATION OF PLATE LXVI.
FigS. 1-5. PSEUDOSYRINX GIGAS n. Sp p. 410
Anterior, posterior, lateral, pedicle and brachial views of the holo-
type, a nearly complete specimen. (W. M., No. 12805.)
Keokuk (?) , Kentucky.
Figs. 6-10. PSEUDOSYRINX KEOKUK n. sp p. 408
Posterior, anterior, brachial, pedicle and lateral views of a nearly
complete internal cast. (W. M.. No. 5634.)
Residual chert, Springfield, Missouri.
Figs. 11-13. PSEUDOSYRINX MISSOURIENSIS n. sp p. 406
11. View of the cardinal area of an incomplete pedicle valve. 12.
Lateral view of an incomplete pedicle valve. (W. M., No.
13967.)
Burlington white chert, Louisiana, Missouri.
13. View of the cardinal area of an incomplete pedicle vn'.ve.
(W. M., No. 13559.)
Burlington limestone, Osccola, Missouri.
148
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXVI.
12
EXPLANATION OF PLATE LXVII.
FigS. 1-9. PSEUDOSYRINX KEOKUK n. Sp p. 408
1-5. Posterior, anterior, lateral, pedicle and brachial views of a
nearly complete internal cast. Cotype. (W. M., No. 13026.)
Residual chert.
6-9. Posterior, anterior, pedicle and lateral views of a nearly
complete specimen. Cotype. (W. M., No. 13020.)
Keokuk limestone, Warsaw, Illinois.
Fig. 10. PSEUDOSYRINX sp.
View of the cardinal area of an incomplete pedicle valve. (\Y.
M., No. 12807.)
Crawfordsvillc beds, Crawfordsvillc, Indiana.
Figs. 11-13. PSEUDOSYRINX SAMPSONI Weller p. 405
11. View of the cardinal area of an incomplete specimen appar-
ently belonging to this species. (W. M., No. 12816.)
Keokuk limestone, Warsaw, Illinois.
12-13. Posterior and anterior views of the holotype. (F. A.
Sampson.)
Fern Glen formation, Fern Glen, Missouri.
150
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXVII.
EXPLANATION OF PLATE LXVIII.
Figs. 1-7. SYRINGOTHYRIS HANNIBALENSIS (Swallow) p. 388
1-5. Posterior, anterior, brachial, pedicle and lateral views of a
very perfect exfoliated specimen. (W. M., No. 1086.) 6-7.
Interior views of two pedicle valves showing the syrinx.
(W. M., No. 13956.)
Louisiana limestone, Louisiana, Missouri.
Figs. 8-15. SYRINGOTHYRIS NEWARKENSIS n. sp p. .594
8-11. Posterior, anterior, brachial and lateral views of a some-
what restored specimen. 12-15. Lateral, posterior, anterior
and brachial views of another specimen. Cotypes. (D. K.
G., No. 3002.)
Chouteau limestone, Newark, Kno.r County, Missouri.
152
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXVIII.
15
14
EXPLANATION OF PLATE LXIX.
Figs. 1-5. SYRINGOTHYRIS TYPUS Winchell p. 395
Posterior, lateral, anterior, brachial and pedicle views of a nearly
complete specimen. (W. M., No. 8630.)
Burlington limestone, Pike Comity, Illinois.
Figs. 6-9. SYRINGOTHYRIS TEXTUS (Hall) p. 399
6-7. Anterior and brachial views of a rather small example. 8.
Posterior view of a larger specimen showing the syrinx.
9. Lateral view of another large specimen. (W. M., No.
13959.)
Knobstone formation, New Albany, Indiana.
154
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXIX.
m
EXPLANATION OF PLATE LXX.
Figs. 1-4. SYRINGOTHYRIS TEXTUS (Hall; p. 399
Posterior, anterior, brachial and lateral views of a nearly com-
plete specimen. (W. M., No. 3275.)
Knobstonc formation, New Providence, Indiana.
Fig. 5. SYRINGOTHYRIS SOLIDIROSTRIS n. sp p. 403
View of the cardinal area and the interior of a pedicle valve,
the holotype. (W. M., No. 12814.)
Kcokuk limestone, Kcokuk, lou'a.
Figs. 6-15. SYRINGOTHYRIS MISSOURI Hall and Clarke p. 393
6-9. Anterior, posterior, brachial and lateral views of the holo-
type. (W. M., No. 11954.)
Choutcau limestone, Choutcau Springs, Missouri.
10-13. Anterior, posterior, brachial and pedicle views of a nearly
complete specimen. 14-15. Posterior and lateral views of
another specimen. (W. M., No. 13957.)
Chouteau limestone, Dogtown Creek, Calhoun Co., Illinois.
156
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXX.
EXPLANATION OF PLATE LXXI.
Figs. 1-2. SYRINGOTHYRIS TEXTUS (Hall) p. 399
Anterior and posterior views of a nearly complete internal cast.
(W. M., No. 7915.)
Residual chert, Jasper County, Missouri.
Figs. 3-7. SYRINGOTHYRIS SUBCUSPIDATUS (Hall) p. 401
Anterior, brachial, lateral, posterior and pedicle views of a nearly
perfect specimen. (W. M., No. 8634.)
Keoknk limestone, Warsaw, Illinois.
Figs. 8-9. SYRINGOTHYRIS? sp.
8. Posterior view of a nearly complete specimen. 9. Anterior view
of another example. (W. M., No. 13964.)
Hannibal sandstone, Louisiana, Missouri.
158
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXI.
EXPLANATION OF PLATE LXXII.
Figs. 1-4. SYRINGOTHYRIS PLATYPLEURUS n. sp p. 397
1-3. Posterior, anterior and lateral views of a nearly complete
internal cast. Holotype. (W. M., No. 13955.)
Residual chert, Sedalia, Missouri.
4. View of the inner surface of the cardinal area of a pedicle valve
showing the delthyrial plate with the syrinx. (W. M.,
No. 7914.)
Burlington limestone, Osceola, Missouri.
Figs. 5-12. SYRINGOTHYRIS EXTENUATUS (Hall) p. 386
5-6. Posterior and pedicle views of a nearly complete pedicle valve.
7. View of the cardinal area of another specimen. (W. M.,
No. 13960.)
Kinderhook, Bed No. 3, Burlington, Iowa.
8-12. Posterior, anterior, brachial, pedicle and lateral views of a
nearly complete internal cast. (W. M., No. 5929.)
Chonopectus sandstone, Burlington, lozua.
Figs. 13-23. SYRINGOTHYRIS HALLI W'inchell p. 390
13-17. Posterior, anterior, pedicle, brachial and lateral views of
one of Winchell's cotypes. (W. M., No. 1369.)
Kinderhook, Bed No. 4, Burlington, Iowa.
18-22. Posterior, anterior, pedicle, brachial and lateral views of a
nearly complete specimen. 23. View of a very perfect brachial
valve. (W. M., No. 4614.)
Kinderhook, Bed No. 4, Flint River, near Burlington, Iou<a.
160
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXII.
EXPLANATION OF PLATE LXXIII.
Figs. 1-5. SYRINGOTHYRIS CUSPIDATUS Martin.
Anterior, pedicle, posterior, brachial and lateral views of a very
perfect specimen, introduced for comparison with our Ameri-
can species. (W. M., No. 12519.)
Carboniferous limestone, Waulsort, Belgium.
Figs. 6-7. SYRINGOTHYRIS (?) sp.
Posterior and lateral views of a nearly complete specimen. (W. M.,
No. 13961.)
Chouteau limestone, Providence, Missouri.
Figs. 8-10. SYRINGOTHYRIS BUSHEERGENSIS n. sp p. 391
8. Posterior view of an incomplete internal cast of a pedicle valve.
9. Plaster cast from a natural mould showing the cardinal area
of a pedicle valve. 10. Internal cast of an incomplete pedicle
valve showing an impression of the syrinx. (W. M., No.
13970.)
Bushberg sandstone, near Sulphur Springs, Missouri.
162
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXIII.
EXPLANATION OF PLATE LXXIV.
Figs. 1-11. RETICULARIA PSEUDOLINEATA (Hall) p. 429
1-5. Pedicle, brachial, posterior, anterior and lateral views of the
holotype. (W. M., No. 7555.)
Keokuk limestone, Warsaw, Illinois.
6-8. Pedicle, brachial and lateral views of a nearly complete speci-
men. 9. View of a somewhat crushed pedicle valve. (W. M.,
No. 13737.)
Keokuk limestone, Keokuk, Iowa.
10-11. Pedicle and brachial views of a nearly complete internal
cast. (D. K. G.. No. 2501.)
Residual chert, South Branch, Callaway County, Missouri.
Figs. 12-22. RETICULARIA SETIGERA (Hall) p. 431
12-16. Pedicle, brachial, posterior, anterior and lateral views of
a very perfect specimen. (W. M., No. 7696.)
Chester Group, Southern Illinois.
17. View of the internal cast of a pedicle valve. 18. View of the
internal cast of a brachial valve. (W. M., No. 13972.)
Seneca chert, Seneca, Missouri.
19-22. Pedicle, brachial, lateral and posterior views of a nearly
complete specimen. (W. M., No. 7632.)
Chester Group, Monroe County, Illinois.
164
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXIV.
22
EXPLANATION OF PLATE LXXV.
Figs. 1-10. MARTINIA CONTRACTA (Meek and Worthen) p. 420
1-4. Pedicle, brachial, lateral and anterior views of a very per-
fect specimen. 5-7. Pedicle, brachial and posterior views of
another specimen. 8-10. Lateral, brachial and anterior views
of a third specimen. (W. M., No. 14777.)
Chester Group, Red Bud, Illinois.
Figs. 11-14. MARTINIA SULCATA n. sp p. 422
11-13. Pedicle, brachial and anterior views of a nearly complete
specimen. 14. Brachial view of another specimen. Cotypes.
(W. M., No. 13677.) '
Chester Group, Meade County, Kentucky.
Figs. 15-19. RETICULARIA SALEMENSIS n. sp p. 433
Pedicle, brachial, lateral, posterior and anterior views of the
holotype. (W. M., No. 7558.)
Salon limestone, Lanesi'ille, Indiana.
Fig. 20. RETICULARIA PSEUDOLINEATA (Hall) p. 429
Posterior view of an internal cast probably belonging to this
species. (W. M., No. 10764.)
Residual chert, Springfield, Missouri.
Figs. 21-33. RETICULARIA COOPERENSIS (Swallow) p. 428
21-25. Pedicle, brachial, lateral, posterior and anterior views of the
holotype of R. hirta White and Whitfield. (U. M., No. 1367.)
Kinder ho ok, Bed No. 7 , Burlington, Iowa.
26-30. Anterior, lateral, pedicle, brachial and posterior views of a
nearly complete specimen. 30-33. Pedicle, anterior and bra-
chial views of another specimen. (W. M., No. 9701.)
Chouteau limestone, I'ettis County, Missouri.
166
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXV.
EXPLANATION OF PLATE LXXVI.
Figs. 1-3. ACAMBONA PRIMA White p. 449
Pedicle, brachial and lateral views of the holotype. (U. M., No.
1705.)
Burlington limestone, Burlington, Iowa.
Figs. 4-6. EUMETRIA PERSTRIALIS Rowley p. 441
Pedicle, brachial and lateral views of the holotype. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 7-11. EUMETRIA ALTIROSTRIS (White) p. 438
7-10. Brachial, lateral, posterior and anterior views of a nearly
complete specimen. 11. Brachial view of another specimen.
(W. M., No. 10575.)
English River Gritstone, Maple Mill, Washington County,
Iowa.
Fig. 12. EUMETRIA OSAGENSIS (Swallow) p. 439
Brachial view of an imperfect specimen. (W. M., No. 12387.)
Chouteau limestone, Missouri.
Figs. 13-17. EUMETRIA VERA (Hall) p. 444
Pedicle, brachial, lateral, anterior and posterior views of a nearly
perfect specimen. (W. M., No. 13575.)
Chester Group, Chester, Illinois.
Figs. 18-24. EUMETRIA VERNEUILIANA (Hall) p. 442
18-21. Brachial, pedicle, anterior and lateral views of a nearly per-
fect specimen. 22-24. Pedicle, brachial and lateral views of
another specimen.^ (W. M., No. 7830.)
Salem limestone, Spergen Hill, Indiana.
Figs. 25-29. EUMETRIA COSTATA (Hall) p. 445
Pedicle, lateral, brachial, anterior and posterior views of a nearly
perfect specimen. (W. M., No. 7833.)
Chester Group, Chester, Illinois.
Figs. 30-34. EUMETRIA ACUTICOSTA n. sp p. 447
Pedicle, brachial, lateral, anterior and posterior views of the holo-
type. (W. M., No. 14778.)
Chester Group, Johnson County, Illinois.
Figs. 35-46. PTYCHOSPIRA SEXPLICATA (White and Whitfield) p. 435
35-39. Pedicle, brachial, lateral, posterior and anterior views of a
nearly perfect specimen. 40-43. Pedicle, brachial, lateral and
anterior views of another specimen. (W. M., No. 9688.)
Chouteau limestone, Pettis County, Missouri.
44-46. Pedicle, brachial and anterior views of a metatype of Retzia
raricosta Rowley. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 47-52. HUSTEDIA CIRCULARIS (Miller) p. 451
47-49. Pedicle, brachial and lateral views of a nearly perfect speci-
men. (D. K. G., No. 1801.)
Chouteau limestone, Sedalia, Missouri.
50-52. Pedicle, brachial and lateral views of another specimen.
(W. M., No. 9727.)
Chouteau limestone, Pettis County, Missouri.
168
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXVI.
37 40 41 42
* + * *
44 45 46 38 39 47 48 49 5O 51
EXPLANATION OF PLATE LXXVII.
Figs. 1-20. ATHYRIS CRASSICARDINALIS White p. 471
1-2. Exterior and interior views of a brachial valve. 3-4. Exterior
and interior views of a small pedicle valve. Cotypes. (U. M.,
No. 1358.)
Kinderhook, Bed No. 7, Burlington, Iowa.
5-6. Exterior and interior views of a brachial valve. 7. Posterior
view of a shell with both valves in articulation. 8-9. Exterior
and interior views of a small pedicle valve. 10-11, and
12-13. Exterior and interior views of two pedicle valves.
14-16. Exterior views of three pedicle valves. 17-18. Exterior
and interior views of a brachial valve. 19. Exterior view of
a brachial valve. 20. Interior view of a brachial valve. (W.
M., No. 9817.)
Chouteau limestone, Sedalia, Missouri.
Figs. 21-25. ATHYRIS CRASSICARDINALIS White (??).
21-23. Pedicle, brachial and lateral views of a nearly complete
pedicle valve. 24-25. Views of two brachial valves. (W. M.,
No. 6679.)
Kinderhook, Bed No. 6, Burlington, Iowa.
Figs. 26-31. AMBOCOZLIA LEVICULA Rowley p. 426
26-28. Pedicle, brachial and lateral views of a metatype. 29-31.
Similar views of the same specimen enlarged (x4). (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 32-35. AMBOCCELIA PARVA Weller p. 424
32-33. Views of two pedicle valves, cotypes. 34-35. Views of the
same specimens enlarged (x4). (W. M., No. 5952.)
Northview sandstone, Northview, Missouri.
Figs. 36-43. AMBOCCELIA UNIONENSIS n. sp p. 425
36-37. Views of two pedicle valves. 38-39. Views of the same
specimens enlarged (x4). 40. View of a brachial valve.
41. View of the same specimen enlarged (x4). 42-43. Views
of two large pedicle valves. Cotypes. (W. M., No. 14782.)
Kinderhook, Zl/2 miles northwest of Jonesboro, Illinois.
Figs. 44-54. AMBOCCELIA MINUTA White p. 423
44-47. Pedicle, brachial, lateral and posterior views of a large
specimen (x4). 48-50. Pedicle, brachial and lateral views of
another specimen (x4). 51-54. Pedicle, brachial, lateral and
posterior views of a third specimen (x4). (W. M., No. 6719.)
Louisiana limestone, Louisiana, Missouri.
Figs. 55-59. COMPOSITA (?) CORPULENTA (Winchell) p. 495
Pedicle, brachial, lateral, anterior and posterior views of a nearly
complete specimen. (W. M., No. 13899.)
Chonopectus sandstone, Burlington, Iowa.
171
Figs. 60-69. ATHYRIS DENSA Hall and Clarke p. 469
60-63. Pedicle, brachial, lateral and anterior views of a nearly com-
plete specimen. 64-65. Exterior and interior views of a nearly
perfect pedicle valve. 66-67. Exterior and interior views of
another pedicle valve. Cotypes. (W. M., No. 12364.)
Salem limestone, Colesburgh, Kentucky.
68-69. External and internal views of a pedicle valve, the holotype
of Centronella crassicardinalis White. (A. M. N. H., No.
5067—1.)
Salem limestone, Spergen Hill, Indiana.
172
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXVII.
4 5
1O 11
12 13 14 15 16
6789
" ^| •<
17 18
19
2O
26 27 28
21 22 23
33
24 25
*
35
36 37 34
31 3O 29
42 43
> J
42
w ' , ( "S
38
40
44 45 46 47
48
39
49 5O 51 52 53
54
55
56
57
58
59
60
*%->*
'T^
^*
63
68
64
65
66
67
69
EXPLANATION OF PLATE LXXVIII.
Figs. 1-5. ATHYRIS LAMELLOSA (Leveille) p. 465
1. Pedicle view of a nearly complete specimen. (W. M., No. 7605.)
Keokuk limestone, Warsaw, Illinois.
2. Pedicle view of a nearly complete internal cast. (W. M., No.
14224.)
Residual chert, Cooper County, Missouri.
3-4. Pedicle and posterior views of a nearly complete internal cast.
(W. M., No. 7599.)
Burlington chert, Louisiana, Missouri.
Figs. 6-9. ATHYRIS PAPILIONIFORMIS McChesney p. 468
Pedicle, brachial, lateral and posterior views of a sulphur cast of
the holotype. (W. M., No. 13232.)
Chester Group, Fountain Bluff, Illinois.
Figs. 10-14. ATHYRIS HANNIBALENSIS (Swallow) p. 467
10-12. Lateral, brachial and anterior views of a nearly complete
specimen. 13-14. Pedicle and posterior views of another speci-
men. (W. M., No. 6690.)
Louisiana limestone, Louisiana, Missouri.
Figs. 15-20. ATHYRIS LAMELLOSA (Leveille) p. 465
15-16. Views of two pedicle valves upon one of which the lamellar
extensions of the shell are well preserved. (W. M., No. 13539.)
Fern Glen formation, Fern Glen, Missouri.
17-20. Brachial, pedicle, lateral and anterior views of an exfoliated
specimen. (W. M., No. 8545.)
Pierson limestone, near Springfield, Missouri.
Figs. 21-24. CLIOTHYRIDINA GLENPARKENSIS n. sp p. 473
21-22. Pedicle and lateral views of a nearly complete specimen.
23-24. Brachial and posterior views of another specimen. (W.
M., No. 13901.)
Fern Glen -formation, Fern Glen, Missouri.
Fig. 25. CLIOTHYRIDINA PARVIROSTRA (Meek and Worthen) p. 481
View of the internal cast of a pedicle valve. (W. M., No. 383.)
Residual chert, Springfield, Missouri.
174
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXVIII.
EXPLANATION OF PLATE LXXIX.
Figs. 1-11. CLIOTHYRIDINA OBMAXIMA (McChesney) p. 475
1. View of a large pedicle valve. (W. M., No. 7592.)
Fern Glen formation, Monroe County, Illinois.
2-6. Pedicle, brachial, anterior, posterior and lateral views of a
nearly perfect specimen! (W. M., No. 13917.)
Fern Glen formation, Chautauqua, Illinois.
7-11. Pedicle, brachial, anterior, lateral and posterior views of a
nearly perfect specimen. (W. M., No. 7596.)
Keokuk limestone, Keokuk, Iowa.
Fig. 12. CLIOTHYRIDINA INCRASSATA (Hall) p. 4/7
View of a pedicle valve. (W. M., No. 342.)
Burlington limestone, Springfield, Missouri.
Figs. 13-16. CLIOTHYRIDINA PROUTI (Swallow) p. 474
Pedicle, brachial, anterior and lateral views of a nearly perfect
specimen. (W. M., No. 46951.)
Fern Glen formation, near Kimmswick, Missouri.
176
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXIX.
15
EXPLANATION OF PLATE LXXX.
Figs. 1-12. CLIOTHYRIDINA TENUILINEATA (Rowley) p. 478
1-3, 4-6. Pedicle, brachial and lateral views of two specimens. (U.
M., No. 1358.)
Kinderhook, Bed No. 6, Burlington, Iowa.
7-9, 10-12. Pedicle, brachial and lateral views of two specimens,
metatypes. (R. R. R.)
Burlington white chert, Louisiana, Missouri.
Figs. 13-24. CLIOTHYRIDINA HIRSUTA (Hall) p. 479
13-15, 16-18. Pedicle, brachial and lateral views of two specimens.
(W. M., No. 13920.)
Salem limestone, Hull's Hollow, Madison County, Illinois.
19-21, 22-24. Pedicle, brachial and lateral views of two specimens.
(W. M., No. 1369.)
Salem limestone, near Boonville, Missouri.
Figs. 25-30. CLIOTHYRIDINA LENTICULARIS n. sp p. 480
25-27, 28-30. Pedicle, brachial and lateral views of two specimens.
(W. M., No. 12992.) .
St. Louis limestone, near Carondelet, Missouri.
Figs. 31-60. CLIOTHYRIDINA SUBLAMELLOSA (Hall) p. 482
31-33, 34-36. Pedicle, brachial and lateral views of two young speci-
mens having the form and size of C. hirsuta. (W. M.,
No. 7628.)
Chester Group, Chester, Illinois.
37-39, 40-42, 43-45. Pedicle, brachial and lateral views of three
young specimens having the general character of C. hirsuta.
(W. M., No. 13921.)
Lower Chester, Fairview Point, Hardin Co., Illinois.
46-48. Pedicle, brachial and lateral views of an undistorted but
somewhat exfoliated specimen. 49-50. Pedicle and lateral views
of another specimen. (W. M., No. 7613.)
Chester Group, Chester, Illinois.
51-53, 54-56. Pedicle, brachial and lateral views of two specimens
partially preserving the surface spines. (W. M., No. 7628.)
Chester Group, Chester, Illinois.
57-58. Brachial views of two different specimens. 59-60. Pedicle
views of two other specimens. (W. M., No. 14781.)
Lower Chester, Fairview Point, Hardin Co., Illinois.
Figs. 61-66. CLIOTHYRIDINA PARVIROSTRA (Meek & Worthen) p. 481
61-63. Pedicle, lateral and brachial views of a slightly crushed
specimen. (W. M., No. 7611.)
Keokuk limestone, Jersey County, Illinois.
64-66. Brachial, lateral and pedicle views of a nearly complete
specimen. (W. M., No. 7614.)
Keokuk limestone, Warsaw, Illinois.
178
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXX.
• * J
1 2345 6 13 14 15
J
7 8 9 1O 11 12
16 17 18
19 2O 21 22 23 24 25 26 27
31 32 33 34 35 36 28 29 3O
> I
37 38 39 4O 41 42 43 44 45
46
47
48
49
5O
51
52
53 57
58
54
55
56
59
6O
61 62 63 64 65 66
EXPLANATION OF PLATE LXXXI.
Figs. 1-15. COMPOSITA SUBQUADRATA (Hall) p. 489
1-4. Pedicle, brachial, posterior and lateral views of a nearly
perfect specimen. 5-8. Anterior, pedicle, brachial and pos-
terior views of another specimen. (W. M., No. 7627.)
Chester Group, Chester, Illinois.
9-11. Pedicle, anterior and lateral views of a nearly complete
specimen. 12-15. Brachial, lateral, anterior and posterior
views of a nearly complete specimen. (W. M., No. 13926.)
Chester Group, Chester, Illinois.
Figs. 16-45. COMPOSITA TRINUCLEA (Hall) p. 486
16-20. Pedicle, brachial, lateral, posterior and anterior views of a
very perfect specimen. 21-24. Pedicle, brachial, anterior and
posterior views of another specimen. 25-26. Pedicle and
brachial views of a third specimen. (W. M., No. 7620.) 27-30.
Pedicle, brachial, lateral and anterior views of a nearly per-
fect specimen. (W. M., No. 389.)
Salem limestone, Spcrgcn Hill, Indiana.
31-34. Lateral, pedicle, brachial and anterior views of a nearly
perfect, large example. (W. M., No. 13926.)
Salem limestone, Hull's Hollow, Madison County, Illinois.
35-36. Pedicle and lateral views of a very narrow and elongate
example. 37-38. Brachial and anterior views of an old shell.
39-42. Pedicle, lateral, anterior and posterior views of a nearly
perfect specimen. 43. Brachial view of a nearly perfect
specimen. 44-45. Anterior and posterior views of another
specimen. (W. M., No. 7617.)
Pclla Beds, Pella, Iowa.
Figs. 46-51. COMPOSITA LEWISENSIS n. sp p. 488
46-48. Pedicle, brachial and posterior views of a nearly perfect
specimen. 49-51. Pedicle, lateral and anterior views of an-
other specimen. Cotypes. (D. K. G., No. 203.)
Patrick Quarry, Middle Fabius River, Lewis County, Mis-
souri.
Figs. 52-57. COMPOSITA PENTAGONIA n. sp p. 492
52-54. Posterior, lateral and pedicle views of a very perfect
internal cast. 55-57. Anterior, lateral and brachial views of
another example. Cotypes. (D. K. G., No. 102.)
Residual chert, South Branch, Callaway County, Missouri.
\ 80
ILLINOIS STATE GEOLOGICAL SURVEY.
MONOGRAPH No. 1. PLATE LXXXI.
10
11
12
13
^^^m^^r
16 17 18 19 2O 14 15
21 22
23
'9^^
24
25 26
48
27 28 29
30
»
52 53
54
35
46 47
W ll f
36
44 45 41
42 38
EXPLANATION OF PLATE LXXXII.
Figs. 1-10. COMPOSITA SULCATA n. sp p. 490
1-5. Pedicle, brachial, lateral, posterior and anterior views of a
nearly complete specimen. 6-10. Anterior, posterior, brachial,
lateral and pedicle views of a smaller example. Cotypes.
(W. M., No. 13782.)
Chester Group, Mcadc County, Kentucky.
Figs. 11-13. COMPOSITA OPPOSITA (White and Whitfield) p. 494
Pedicle, brachial and lateral views of the holotype. (A. M. N. H.,
No. 5000-1.)
Upper Kinderhook, Burlington, Iowa.
Figs. 14-20. COMPOSITA L^VIS n. sp p. 491
14-17. Pedicle, brachial, lateral and posterior views of a very per-
fect specimen. 18-20. Pedicle, brachial and anterior views of
another specimen. Cotypes. (D. K. G., No. 303.)
Chester Group, Breckinridgc Co., Kentucky.
Figs. 21-26. COMPOSITA GLOBOSA n. sp p. 493
21-23. Pedicle, lateral and anterior views of a nearly perfect speci-
men. 24-26. Brachial, posterior and anterior views of another
specimen. Cotypes. (W. M., No. 3003.)
Keokuk limestone, near Springfield, Missouri.
Figs. 27-38. NUCLEOSPIRA BARRISI White p. 455
27-31. Pedicle, brachial, posterior, anterior and lateral views of a
nearly complete specimen. 32-33. Exterior and interior views
of a pedicle valve. 34-35. Exterior and interior views of an-
other pedicle valve. 36. View of a pedicle valve. 37. View of
a brachial valve. 38. Interior view of an imperfect brachial
valve. Cotypes. (U. M., No. 1360.)
Kinderhook, Bed No. 7, Burlington, Iowa.
Figs. 39-42. NUCLEOSPIRA OBESA Rowley p. 457
39-41. Pedicle, brachial and lateral views of a metatype. 42.
Brachial view of the same specimen enlarged (x3). (R. R.
R.)
Burlington white chert, Louisiana, Missouri.
Figs. 43-48. NUCLEOSPIRA ROWLEYI n. sp p. 454
43-44, 45-46, 47-48. Pedicle and brachial views of three different
individuals, enlarged (x 4). Cotypes. (W. M., No. 6733.
Louisiana limestone, Louisiana, Missouri.
Figs. 49-60. NUCLEOSPIRA MINIMA Weller p. 456
49-54. Views of six separate valves. 55-60. Views of the same
valves enlarged (x4). Cotypes. (W. M., No. 11349.)
Glen Park limestone, Glen Park, Missouri.
Figs. 61-63. CAMAROPHORELLA LENTICULARIS (White and Whitfield) .. .p. 459
61. View of an internal cast of a pedicle valve. 62-63. Views of
two internal casts of brachial valves. Cotypes. (U. M., No. 1356.)
Kinderhook, Bed No. 5, Burlington, Iowa.
183
Figs. 64-69. ROWLEYELLA FABULITUS (Rowley) p. 463
64. Pedicle view of a nearly complete specimen from which the
shell is partially removed, showing the median septum. The
spiral brachidium is clearly shown in this specimen, but does not
appear in the photograph. 65-66. Pedicle and brachial views of
the same specimen enlarged (x4). 67. Pedicle view of a smaller
specimen from which the shell has been removed on each side.
68-69. Pedicle and brachial views of the same specimen (x4)
showing the median septum in each valve. (W. M., No. 14279.)
Burlington white chert, Louisiana, Missouri.
Figs. 70-79. CAMAROPHORELLA MTSSOURIENSIS (Winchell) p. 460
70-73. Pedicle, brachial, lateral and anterior views of the holotype.
(U. M., No. 1993.) 74-76, 77-79. Pedicle, brachial and lateral
views of two specimens, metatypes of Seminula buckleyi Row-
ley. (R. R. R.)
Louisiana limestone, Louisiana, Missouri.
184
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXXII.
11 12 13
:x
8 9 10
"
28 29 30 31
23
32 34
36 37 33 35 38
) J •
43 44 45 46 47 48
55
39 40 41 42
> s s
49 51 53
*
56
57
61 62 63
;•
* >
58 5O 54 52
68 69 59 6O
65
64
66 67 7O
71 72
73
74
75
J
> j
76 77 78 79
EXPLANATION OF PLATE LXXXIII.
Figs. 1-2. SPIRIFER FORBESI Norwood and Pratten p. 331
Views of two separate brachial valves. (W. M., Nos. 5654 and
13531.)
Burlington limestone, Springfield, Missouri, and Burling-
ton, Iowa.
Figs. 3-5. BRACHYTHYRIS PECULIARIS (Shumard) p. 381
Pedicle, brachial and lateral views of a very perfect specimen.
(W. M., No. 14780.)
Chouteau limestone, Calhoun County, Illinois.
Fig. 6. BRACHYTHYRIS BURLINGTONENSIS n. sp p. 371
Brachial view of an internal cast. (W. M., No. 7501.)
Kinder hook, Bed No. 5, Burlington, Iowa.
Figs. 7-8. RHIPIDOMELLA BURLINGTONENSIS (Hall) p. 149
Interior views of the pedicle and brachial valves of one individual.
(W. M., No. 7858.)
Burlington limestone, Burlington, loiva.
Figs. 9-10. RHIPIDOMELLA DUBIA (Hall) p. 160
Interior views of a pedicle and a brachial valve. (W. M., Nos.
7846 and 11927.)
Salem limestone, Colesburg, Kentucky, and Spergen Hill,
Indiana.
Fig. 11. SCHELLWIENELLA INFLATA (White and Whitfield) . p. 59
View of an internal cast of a pedicle valve. (W. M., No. 14759.)
Kinderhook, Bed No. 7, Burlington, Iowa.
Figs. 12-13. PRODUCTUS INDIANENSIS Hall p. 131
Pedicle and lateral views of the holotype. (A. M. N. H., No. 5087)
Salem limestone, Spergen Hill, Indiana.
Figs. 14-17 PRODUCTUS MESIALIS Hall p. 112
14-16. Pedicle, posterior and lateral views of a pedicle valve. 17.
View of an impression of the exterior of a brachial valve. Co-
types. (A. M. N. H., No. 5090.)
Keokuk limestone, Nauvoo, Illinois.
Figs. 18-20. PRODUCTELLA SUBL^VIS n. sp p. 102
18-19. Views of the more or less modified internal casts of two
pedicle valves. 20. View of an incomplete external impression
of a brachial valve. (W. M., No. 10558.)
Kinderhook sandstone, Kinderhook, Illinois.
Figs. 21-22. CHONOPECTUS FISCHERI (Norwood and Pratten) p. 96
21. View of the internal cast of a large pedicle valve. 22. View
of an impression of the pedicle valve showing the cardinal
spines. (W. M., No. 14779.)
Chonopectus sandstone, Burlington, lozva.
186
ILLINOIS STATE GEOLOGICAL SURVEY. MONOGRAPH No. 1. PLATE LXXXIII.
8
12
13
1O
16
I 14 DAY USE
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